The reason why is that it is no one's fucking business what is in his tax returns. Not yours, or anyone else in this thread that thinks they are somehow "entitled" to know his personal business just because he is the POTUS.
I love the fact that he won't release them and that it drives the liberals/progressives into the frothing mess that they are. I laugh out loud - on a daily basis - at all the impotent outrage displayed by the alt-left, antifa, anti-Trumpers.
He will release his taxes when he damn well feels like it and in the meantime there isn't a fucking thing the alt-left can do to change that. LOL.