Well a lot of people who are willing to take things this far don't really care about the consequences of their actions anyway, so in a way I'm kind of surprised there are so many mass shootings involving innocent people, yet so few targeted attacks on scumbags like the CEO of United Healthcare.
For many who are pushed far enough to carry out something like this, achieving their objective is more important than their own life.
Unfortunately, the victims are so often people who don't deserve it.
I assumed they were specifically talking about babies. If there's a genuine issue then it makes sense, but I don't know of anything that's diagnosable at birth that would require circumcision.
I know a lot of young adults also get the procedure for the same reason as you. I was in your boat until probably my mid-teens before things fixed themselves, but it clearly doesn't work out that way for some.