is there any reason to not want to sign this
Another reason is you're a normal person who doesn't give a stuff about tax returns
I think you'd be hopping up and down with rage if Hillary Clinton promised to release hers and later refused to do so for the likely purposes of concealing hidden funding.
So you wouldn't care if he was skirting tax law? Does that make him savvy in your mind?
If he was skirting tax law then I wouldn't like it, but that doesn't chance my stance that I don't care if he releases his tax returns or not. Same if anyone else got elected.
Ignorance is bliss?
If he was skirting tax law then I wouldn't like it