I wonder if Facebook's claims that they are doing this in order to make patents useless would have legal standing. In other words, if they become "evil" about t

I wonder if Facebook's claims that they are doing this in order to make patents useless would have legal standing. In other words, if they become "evil" about this patent clause at some point in the future and try to enforce this in the bad ways that people are imagining might happen, then doesn't Facebook's clearly and publicly stated intentions hurt any claim they would make which goes against those intentions?