-Fred Hampton was a black activist from Chicago -- an extraordinary speaker, youth organizer for the NAACP.
-He joined the Black Panthers and shone so brightly that he was made chair of the Chicago chapter when he was only 20.
-He founded the Rainbow Coalition, which brought together Black and Latino activists and radical anti-poverty Catholics. He forged an alliance among major Chicago street gangs to help them make peace and work for social change.
-In 1967, when he was just 19, Hampton was identified by the FBI as a “radical threat.” The FBI tried to subvert his activities in Chicago, sowing disinformation to get the groups he’d drawn together to distrust each other, and getting an FBI plant next to him as a bodyguard.
-(This is part of an illegal FBI program called COINTELPRO, which aimed to paint black civil rights activists (among others) as violent and threatening. If you’ve only seen pictures of the Black Panthers as armed and dangerous revolutionaries, and never heard of their children’s breakfast program, their community health clinics, or their “copwatch” patrols, this is why. It’s because COINTELPRO was a highly successful work of political propaganda.)
-On December 3, 1969, Hampton taught a political education course at a local church, and then several Panthers gathered at his apartment for a late dinner. One of them was the FBI plant bodyguard, who drugged Hampton.
-At 4:45 AM on December 4, a squad of Chicago Police officers and FBI agents with a warrant to search for weapons stormed the apartment. Investigations later showed they fired between 90 and 99 times. The Panther on security detail, Mark Clark, was holding a shotgun. He was shot, and the gun went off into the ceiling. This was the only shot fired by the Panthers.
-Fred Hampton, in another room, didn’t awaken. He was shot in his bed. Twice, in the head, at point-blank range. He was 21.
-Four weeks after witnessing Hampton's death, his finance Deborah Johnson gave birth to their son, Fred Hampton Jr. That’s him in the photograph, visiting the grave of a father who died before he was born. A resting place riddled with bullets.

Can we..... Replace his headstone?
Hear me out. If we replace it with something that is known to reflect small arms fire, there's a nontrivial chance that the next time some asshole shows up to shoot the headstone and piss on his grave (probably), there would be a non-zero chance that person would shoot their own dick off by way of a ricochet.
Stone, while it looks nice and lasts a really long time (when it's not being shot), is great.... But maybe this one time?
Or just camp around there, wait for a shot to go off and then unload on the cop car. Who’s to say the cop wasn’t shooting at you when they’re unlawfully shooting out of their windows?
Murdering a cop would also go a long way in showing support lol
The judge, numerous other cop "witnesses", a jury of your peers...
Self defense you mean, not murdering a cop, standyourgrounding a cop.
You see.... I'm mainly focused on making it so that they hurt themselves. I'm focused on this because booby traps are illegal, and straight up shooting them rarely ends well.
I don't want anyone to get in trouble for their actions. I want the officer(s) to hurt themselves so they get ridiculed for being stupid; both, by their peers and by the public.
Hell, I'd setup a trail camera type situation to keep an eye on things so I can post it to YouTube and/or rejig the situation so that the likelihood of them harming themselves from doing this thing is maximized.
By simply using materials that frequently ricochet bullets.... Nothing illegal has been done. It's not an active trap and it's not a problem, legally, to use the materials. The entire thing is passive, there's nothing that could even be considered a "trap" of any kind, and plausible deniability is easily proven by simply "I replaced it with this because the headstone kept getting damaged, I didn't think anyone would shoot it and hurt themselves your honour"
The only evidence that it was done maliciously would be if someone who was in a position to make it happen, commented here saying that they were intending to do this. If any such person exists and is considering it, I am not a lawyer, but I would advise that person to do so without getting involved in the discussion here at all. That would provide plausible deniability to the action being malicious. All you need is to inspire enough doubt that you can't be convicted.
Anyways I'm well into the weeds here.
I also agree with you that it is not illegal to kill cops (any more than it is illegal to kill anyone else), and defending yourself from the police in a situation where you are justified in using the force you are using, should not be punishable nor a crime, but you and I both know that reality is very divorced from the law and what's legal on this one. Even if you're legally allowed to defend yourself in the situation, the police will shoot and kill you, then walk on "qualified immunity" after they investigate themselves and find no wrongdoing.
Defund the police.