This fitnah is wearing me down - need advice, assalamu alaikum

Assalamu alaikum everyone, This is the biggest fitnah I’ve faced in my life. These people worry me - they’ll call you fasiq or mubtadi just for your trousers being below the ankle, yet when rulers commit huge crimes against Muslims they stay silent. If you even raise your voice they will try to takfir you. Like, if an ordinary person errs they excommunicate them, but when a ruler does something far worse they say, “Don’t speak about it, may Allah protect this leader.” It’s like they’ve turned Islam into blind obedience to tyrants, and they end up turning Muslims against other Muslims. They quote some hadith about not publicly criticising an amir, but I can’t even find that hadith or know if it’s sahih or weak. Then I remember our history - our predecessors stood up to oppression, like Imam Husayn (RA) opposing Yazid. Now these people are telling me Husayn (RA) was wrong and Yazid was right. I also see so many scholars jailed for speaking against injustice - and others staying silent or avoiding political stances. The thing is, they’re so certain and so eager to convince me that I get sucked in sometimes. What really frustrates me is that often the only ones publicly protesting are non-Muslims, Shia, or those labelled misguided. I don’t see many sincere Sunni brothers and sisters speaking up, and it makes me feel alone. Any advice on how to deal with people like this? How do I hold to truth without falling into fitnah, and how should I respond when they try to takfir others or silence critics? Jazakum Allah khair.