From what I am reading, you've hit your thumb more than once. I perfectly know the history and the evolution of alignment. I started playing in 1980 so.... But that alone is not enough for you. I have introduced hundreds in the hobby, and I am still doing it (well, we're on pause with the covid, but once it is over; we will resume our Friday night D&D exhibition games). And guess what, since the end of the 80s, I have to personally see the horror stories you claim that are so common even now.
I use alignment for
NPCs that will stay unnamed as way to play them with a simple basic personality.
I use it as a beginner's RP aid.
I use it as a building start for my main villains.
I use it as a quick reference to build varied encounters that will make sense by not using/mixing vastly different aligned monsters/foes.
You keep claiming that every alignment users are getting hurt and yet, I have not seen this in 30 years and I am in contact with about 50 DMs and all of them use alignment as I do. None have had any problems with it. IF alignments were so problematic, I would have witnessed or heard somewhere else other than this forum.
If for you, the alignments are a dangerous tool, it may simply be because you do not know how to use it correctly. Maybe you got hurt by a bad DM and I am truly sorry for you if that is the case. I really am for you seem to be a nice person. But you are cutting yourself from a useful tool. That is your choice. Do not impose it on others.