Because they've grown up online...
For corporations trying to control our online lives, the ability to think critically is the absolute last attribute they want their users to have.
And so not only is the experience designed to appeal to the dumbest of the dumb, it's algorithms are designed to keep them dumb so that they can have them chasing the next tiktok trend, buying everything they them to, and, in the case of politics, directing their collective naivete at your own perceived enemies.
An army of mindless zombies who don't give a shit about anything except the latest social media content to consume is a powerful tool to be used.
At best, they can be mustered to your "cause" with a few bullshit viral posts, and at worst, they're too busy staring at their phones to notice you're fucking over their futures. Win Win.