people who do use “-ism” labels can also be helpful people.

I don't disagree about that either.

What I am saying is that (now again having to reiterate what I said before) if you use a *-ism extensively without properly defining it, you end up giving power to a phenomenon you don't get to control. And someone with the ability to control it, can come in and use it for nefarious purposes, as stated in previous comments.