The USA has a larger military than the next 5 nations combined.

The USA is not under threat from anyone. This would still be true if the US military was a tiny fraction of its current size.

The USA does, however, use its vast military to attack other countries without provocation, seemingly to protect commercial interests.

I don't think it's "childish" to be suspicious of the US Military. I worry about the mentality in the USA that everyone needs to protect themselves all the time with firearms. I don't understand why everyone seems to be scared that someone else is going to do bad things to them if they're not armed to the teeth. I suspect this is projection.