I mean, there are some of us who believe that
1. The "abuse from away fans" is overrated. Other players have played post bad deeds and I can't recall one single sustained campaign of targeted jeering (apart from Beckham/Ronaldo). Yes, images/audio and all, but I think it's worth betting on the fickleness of the general public here. A few games of boos, then most fans move on
2. No one has come to harm as a result of him playing football at Getafe in Spain as far as I'm aware (if anyone knows otherwise please let me know). United is a bigger club and everything is inflated but the horrible acts done are in the past, and unless him playing at Old Trafford would materially impact other players and members of the public in a negative way going forward.
So it's not placing heads in the sand. It's recognizing that if a decision was made to bring him back, that the sky wouldn't fall, and the public wouldn't be at increased risk of sexual assault, and any abuse would fade away as it has for 100% of players who have undergone such in the past, leaving us with a (possibly) valuable player from a football and financial perspective. It would just take a club with backbone (amoral of course) to ignore all the outside noise and focus on the football.