I'm with you on the "I don't know how the social thing works" but, since everyone is allowed to write their theories, maybe the trailer was filled with insults just like his other posts so it was better to delete it, especially during the emmy campaign when your profile is more exposed. This are things his team does, just like protecting him by muting key words like rwrb and homophobic. I wouldn't be surprised if someone on his team deleted the trailer just because they were mad at the way fans were acting.