Obviously the internet and GPS are mostly used for civilian applications. Are you really going to argue that there is a huge civilian market for stealth boats?
GPS is still 100% military, the US Military can kill the civil band of GPS at any time it wants, all of the satellites are own, operated and maintained by US Sat Com.
The internet started as a ARPA research project, the fact that it is used by civilians today is not relevant to the conversation
You stated that "I think advancing military tech is at best neutral, and at worst very, very bad." GPS and the Internet are 2 prime examples of Military Tech has that massively improved the world. Nuclear Power being a 3rd, I can cite 1000's of others.