definitely irresponsible to spend beyond your means, even if you are the Federal government. It is the very definition of irresponsible. Result = Trillion dollar deficits next year, even with an expanding economy. Evenutally, you have to pay the piper. Or if you're old, maybe your kids and grandkids do.
I agree that if combined with corresponding spending cuts, then tax cuts are not irresponsible, in most cases.