HN is quite a glass house. Moralizing then back to selling peoples data and ensuring warehouse workers suffer and get our kids get addicted to doomscrolling, while selling people more shit they don't need. Then use that money to push up house prices.
I'm sure there are people here who have caused a lot of harm to others while working at amazon or google or facebook. Probably even a few who should be behind bars. It's possible that some of them were happy to hear that the CEO was killed. I doubt it's most of us though.
There's a lot of space between "knowingly kills people for profit" and "collects user data from an app/works on a manipulative algorithm" which could make it easy for some people to pretend that they aren't doing "real" harm or to believe that the CEO was a "real problem" while they personally aren't.
I hope that the more people are held accountable for what they do (regardless of how that happens) it'll force others to do some self-reflection even if only out of a sense of self-preservation, but I'd be careful about generalizing too much. The people posting here are a pretty diverse lot, and you can find hypocrisy in any sufficiently large group. I wouldn't call HN a "glass house" but it's got a few big windows.