A fair question. I can only assume, based on myself, that some are too lazy to do more than simply stop going.
Perhaps some don't want the undoubted shite that would come their way for doing so.
I am also not on Twitter so cannot comment. This is the only social media i read, or contribute to. I do agree that there must be some high profile supporters and ex players who are against this. Perhaps they too don't want to become a target or perhaps my view is indeed in the minority. Given that the current state of affairs is so visibly wrong, on so many levels, i find it almost incomprehensible that the majority are ok with it.