oversight means regulation, regulation means bureaucracy, bureaucracy means slow(if any) progress.
perhaps in the future there will arise a need to regulate things, but for now, I don't see any reason at all. competition into the stars should continue unabated in order for us to reach our goals sooner.
Just FYI, there are already spacefaring weapons, and militarization doesn't necessarily mean that they are putting things up there that could kill people. GPS could be considered part of the space militarization.
plus think of the advantage of, say, a space based carrier. Take some fighter bombers that are capable of spaceflight and bam. you've got an instant strike squadron. The sea was and is the most important area to control as far as the miltary is concerned. With more and more going on in space, it only stands to reason that the reach of the armed forces should extend there as well. Say the US and China independantly start thier own extraterrestrial mining operations, should we leave them unprotected? It's not altogether difficult to make a rocket carry a nasty payload into space, so besides the possible threat from another spacefaring nation taking a pot shot at your mining rig, there is the small possability of a less well endowed country shooting at you as well.
Most of this is besides the point however. You need an excuse or reason to get funding approved for anything. If you want to go to space, you appeal to people's interests. Those interests used to be exploration, but now they are money and defense, so you appeal to those. Yes it's a bit less ideal, but it gets the job done. In every area of science that the military has been involved in, there have been huge advances, I think it would be foolish not to have that extend into space travel.
Also, there are already parts of the USAF that deal with space. besides the space command down here at norad, there is also the Space Warfare Center here in the springs.
who controls most of the things in orbit right now anyway? yep, the military. Space has already been militarized, so instead of fighting progress, why don't we reap the benefits and push for civilian travel/studies to piggyback on the military?