https://news.ycombinator.com/item?id=46221729 sounds like cross-examining to me.
https://news.ycombinator.com/item?id=46221631 is not flagged. That might be because we'd already turned off flags on it (I can't remember).
https://news.ycombinator.com/item?id=46221972 I agree should not be flagged and I've unflagged it.
The point isn't so much to litigate each flagged comment, just to highlight how pervasive the flag abuse problem is. And of course, when the flag abusers 'defect' and gain some utility, it is only rational for the 'victims' to themselves defect from the civil conversation and start to abuse flags.
In threads that are, unfortunately, adversarial, abusing the flag button is a stable Nash equilibrium. I think it's a shitty equilibrium, though, and makes real, substantive conversations--ostensibly the goal on this forum--harder to achieve.
I think it's high time to reconsider the current 'flag' mechanics. At the very least I think we would all be better off if flags were simply disabled on highly controversial topics.