Everyone makes their own decisions about the actions they take on a personal level. I try not to buy products containing palm oil, for eg, and it's bloody hard and often i just buy a product because i'm in a hurry and realise later. It doesn't mean I should just pack in and buy All The Palm Oil because i slipped up once or twice.
I remember reading an interview with Peter Gabriel (in Q) in the early 90s and of course it covered South Africa and then the interviewer said "the grapes in this meeting room are Cape Grapes and you've been eating them" like some kind of GOTCHA! at PG. And Gabriel said, rightly, that we can't control everything but if most people avoid the thing most of the time it is enough. Not everything is in your control.
The playing life of a footballer is relatively short, but it has been the majority of their waking moments from the time they're picked up by a club at age 7 or so. They work hard to be as good as they can and the best are selected for their national teams. If they refuse to play, their licence could be revoked as a sanction. Career over. Individual players don't choose where the competition is held. They are young men, and they may not care. They may care deeply but care about their career and their earnings for the rest of their lives. and everything in between. They might be homophobic twats who don't care about dead workers.
So there is no single line of thought (the Germans, typically, have a player committee who discussed and decided on the gesture they made, a yellow card could cock up their chances in the tournament, it's a risk that has consequences. - may not matter for them now anyway)
Nobody is perfect. Nobody can take a stand about everything. And even if you do take a stand, it doesn't have to be your hill to die on.