About cynicism vs. criticism, I'm reminded about something Scott Alexander recounted in his review of Red Plenty, an actual historical event:
(Kantorovich) invented the technique of linear programming, a method of solving optimization problems perfectly suited to allocating resources throughout an economy. He immediately realized its potential and wrote a nice letter to Stalin politely suggesting that his current method of doing economics was wrong and he could do better - this during a time when everyone else in Russia was desperately trying to avoid having Stalin notice them because he tended to kill anyone he noticed. Luckily the letter was intercepted by a kindly mid-level official, who kept it away from Stalin and warehoused Kantorovich in a university somewhere.
Cynicism can be warranted. Of course it's possible to be excessively cynical, but lack of cynicism can be downright deadly. Sometimes you are in situations where you can do little, and the best you can do is still pretty awful. And if you suppress the doubts that could make you cynical, more often than not someone else has to carry those doubts for you, to at least prevent the disasters that ARE preventable.