I believe this timeline is correct:
Sam performed extremely well in college. He was rated a 3rd to 4th round prospect going into the draft.
Then he came out gay and dropped to the 7th.
Then came a media circus and some bad choices by Sam including the Oprah show.
Then he played well in the preseason.
Then came out garbage that his teammates didn't want him to shower with him from ESPN, which may or may not be true.
Then he was cut by the team that drafted him.
Then the NFL made calls to several teams asking for one to pick him up on the practice squad lest the league be judged discriminatory (real or not)
Then Dallas picked him up
Then injuries erupted all over the NFL and no one gave him a shot on their team despite performing extremely well in college and well in the preseason.
To say he has been judged solely on his ability to play football is hogwash. He absolutely has been effected by a mixture of bad choices on his part, the media circus around him (which is also part of those bad choices), and yes outright bigotry.
So I stand by my comment that the whole thing is crap
You forgot that he tested among the worst players at the combine, is undersized, and limited to a 4-3 scheme.
Burfict, as used earlier, tested horribly at the combine, had off field issues and went undrafted.
It seems you're making a lot of assumptions as fact. I'll stand by my stance that if a team thought he could help them win, he'd be playing.
Have all the other players that have been cut from the PS been "a load of crap" to you, or just the openly gay one?