Can I still at least be for war, even though I've never served?
I suppose it could be analogous to a fire. I've never been a firefighter, but if there is a fire, I would support those putting it out.
Likewise, I'm not a doctor, but I would be in favor of medical care.
I've never worked the concession stand at the theater, but I am in favor of people eating popcorn at the movies.