I think this is a topic that is parallel to DayZ was to Arma 3.
What I'm trying to get at is, the multiplayer option on KSP2 will open alot of possibilities.
There are some players whom wish to play casually, build colonies to civilizations. They would like to trade casually and have fun in their own time.
There will also be players who want to play an Age of Empires style game play. They want to also build colonies and civilizations, trade and when things aren't going their way, flip the table and play combat mode when necessary.
There will also be players whom just simply want to Dogfight and build a ship, fly it to the sky and blow stuff up.
What the devs will have to do, and the community for that matter, is set up a system where everybody gets their cake. Doing this through dedicated servers and discords to make everyone happy.
I think simply saying "KSP2 isn't designed for warfare" will block a potentially larger audience ...no matter how brutal their outlook is!