What about supplying weapons or even directly aiding a war effort negates pacifism?

You’re talking about the most extreme as far as determination not commitment, absolutionist pacifists is what they’re called.

They would have a problem with that.

But treating every member of a group like they’re the same as the most extreme…

I’m hesitant to ask but whatever groups do you apply that logic to? It’s rarely (if ever) a good idea.