I wouldnt have a clue whether Giggs has done anything behind the scenes bheind the coaches back, and nobody else on here does either. Seeing him referred to as a rat etc is ridiculous, as are calls for him to be blamed for the current mess.
He is part of the coaching staff, they have collectively done poorly and so collectively take the blame. Van Gaal is ultimately the manager and so he is the figurehead of the coaching staff, and for me takes the most blame as he is steering the ship.
Giggs should take the opportunity to go find himself a manager gig and continue his development. If he thinks he is ready to manage Manchester United then he is delusional, he does not have the experience necessary to take over and be successful. He needs to gain experience first and prove himself elsewhere, if he is good enough he will then have the track record that allow the club and fans to welcome him as manager. Until then, though, it's just a pipe dream for him, and I don't Ed is willing to gamble on Giggs given the precarious state the club finds itself in right now (let's not forget, Ed's job will also be in question if we appoint yet another manager who fails).