Well, I wouldn't exactly say no one is. Often, it ends up being revealed that the people attacking others for these culture war things are usually hiding some d

Well, I wouldn't exactly say no one is. Often, it ends up being revealed that the people attacking others for these culture war things are usually hiding some dark secrets of their own, or acting as hypocrites, and people have made quite a deal out of that. For example, the person whose video about questionable YouTube comments set off an advertiser backlash ended up getting involved in a bunch of stories themselves for making the exact same kind of content (as mentioned by Keemstar, Review Tech USA, etc). The GamerGate controversy had dozens of examples of people getting doxed or revealed as hypocrites, and certain entire forums exist pretty much to dig every bit of random people's personal backgrounds. You're right in that everyone has said something they regetted/should regret, and that people should be more forgiving and understanding, but it's not due to people not looking up the histories of the attackers. It's because everyone even remotely involved in a controversy will basically get doxed to hell and everything they've ever done or said used against them, accused and accuser alike.