Many HN commenters deplore what Israel is doing in Gaza. Their views are certainly not suppressed. But your account is the first I saw calling for striking an entire population. That's shocking, and banning is not a borderline call.
The mystery is why/how it's so easy to turn into the thing one deplores. I'm not just talking about you, but a lot of people, and maybe all of us.
I think the way out of this is to agree that a comment like https://news.ycombinator.com/item?id=45019132 is unacceptable regardless of who the commenter wants to see killed. When you add a "but", you undermine that. There shouldn't be a "but" here.
Exactly the same standard applies to the symmetrical situation. If you (or anyone) see other comments which are that egregious, you're welcome to send us links so we can take a look.