I take it you are unaware that Rand Paul's amendment would not increase the deficit because it would pay for the additional defense spending with offsetting cuts in other areas of the budget
That's part of it, but the major thing is our military is too big now and involved in too many people's shit. It's not just the cost, it's that a bigger military indicates more being involved in other people's business.
It's like domestic spending, the best way to restrict government power over our lives and our economy is to have a smaller government