Every single organisation of any size crosses this problem. You don't constantly hear about the Dems covering up or playing down SA allegations, even though they certainly do. Either because people know an organisation of that size is certainly going to have them or because it's always going to dismissed as "not the organisations fault". People will also always dismiss the organisation playing down these things as a personal issue between members because that's what organisations do, protect themselves, snd in the case of someone abusing power, that's just quietly dealt with eventually when it comes to it and again played down.

The highlighting of it in leftist orgs while clearly not caring about it in capitalist orgs should be viewed as equal to the highlighting of issues that socialist countries have faced while ignoring the same issues in capitalist countries.

If anything it is because leftists take these issues more seriously than liberals that it is used as a frequent method of attacking leftist orgs.