I see what your saying, Spacedoughnut. A least, I think.
Personally, the idea of attaching a weapon on a craft like a Shuttle or Soyuz, etc.
Although it may be inevitible, it makes my stomach turn.
However. The idea of suborbital fighters with lasers and scrams just makes my mouth water from the cool-factor.
Define "militarisation" - suborbital fighters? A dozen LEO carrier stations with KE projectiles? Nuclear warhead platforms in GSO ready to hit any spot on Earth within minutes? The secret Illuminati/alien/Belgian base on the far side of the Moon?
How about ICBMs that already pass through space on the way to their targets, and have done so since the 1950s. How about GPS satellites, which are launched and operated by the military, primarily for the military, the civil use of which is only a side benefit? How about communications links for the military, which are heavily dependant on space? All these things have been real for some time.
I think it is much like any other situation with regions of land. You expand your reach into it, and you better have a reasonable way to secure it or it'll be attractive to others too. The status quo doesn't balance on good intentions. It'll be the same because of who and what has the power to stretch into space, governments... They have the deep pocketbooks and along with those pocketbooks come thier policy enforcement.
Also stating it's against international law is a bit idealistic. There is a bunch of military hardware in space. Aren't nukes sub-orbital? Recall the anti satellite missile tests awhile back? International policy isn't hampering militarization that much.
Space-based military hardware will be the only thing that allows us to defend ourselves when the Hivers attack.
If we end up using it on ourselves first, well that's an unfortunate side effect which has the fortunate outcome of encouraging further development for our own self-defense as a species.
Military expenditure has historically been one of the easiest ways to spend money. The Air Force has a budget of about $150 billion for FY09. NASA gets like $17 billion. Military operations in space will be the absolute fastest way to fuel manned space operations and R&D of spacefaring technologies.
The militarization of space is absurd, but also way too expensive, as long as we live, defend and fight on Earth. Even politicians realized that a long time ago already. And a big human expansion into space by far is not foreseeable now, so militarization of space also is not foreseeable now. And if people would support it at some remote future date or not, the military and governments would not care about you/me/us anyway.
I personally would not agree to militarization of space. But I also feel confident that this won't happen anyway. Space always will be a uniqe and expensive place in my point of view.