He should veto bills that have bad stuff in them. Veto the bill and then force Congress to override the veto or strip out the garbage.
Why not? What's the down side? If they have to work on the same bill two or three times, that's less time that they have to work on new evil things to do.
There really isn't anything that we need new laws to handle. Just remember, almost every bill passed costs some or all of us money and/or our liberty.
I'd tie Congress up as much as possible.
By the same token, if something was passed in the middle of the night or without due deliberation, I'd veto it on principle. Of course, the President is as guilty of this as Congress.
We can't continue this debate into perpetuity. Let's just say we agree to disagree.