> It is my opinion that it is not for us, as open source software developers, to decide whose views are valid and whose are not, and to allow or disallow project or conference participation as a result.
You really should not be in open source if you believe it is your purview to ideologically police the usage and contribution to your software. That notion is incompatible with the spirit of the endeavor.
"If you don't want to help create war machines you can't contribute" is your solution, not mine.
Historically the conventions of open source has been that use is completely without restriction, but there has always been conflict about that. The domain is new enough that I wouldn't consider it settled yet.
One man's arms dealer is another man's defense against death and destruction. I'm no fan of defense contractors for many reasons, but there is a simple reality that you need weapons, and lots of them, to defend yourself and your nation against aggressors, and someone has to build them. Imagine how much worse the war would be going for Ukraine if they didn't have advanced weaponry being provided to them by defense contractors.
If you don't want arms dealers using your work, then don't release it under an open source license.