I have a feeling a lot of those questions are playing out as an internal debate in your head right now.
Everything I write now will probably feel like a personal attack on you and others watching it, but please don't take it like that. It is just my opinion.
For me there is no way to view this without feeling like I am selling out. All of us make unethical choices in daily life constantly. The food we eat, the pollution we cause, the causes we support or ignore, etc. We compartmentalise these choices as we must do, especially where there may be limited access to other options, but mostly as it is just convenient to do so. Watching the world cup however is something I fully control, and if I somehow justified to myself watching it for whatever contrived reason who would I be fooling?
The PR around this WC already is already going wrong in all sorts or ways and this will only snowball through the tournament I would guess. Their attempt at sports washing has already failed in my opinion but it is unlikely it will have any lasting effect unless something more serious happens, maybe even something on the pitch.