Forbidding glorification of violence or weapons

It could be a good thing to forbid glorification of a) violence and/or b) weapons.
My rationale here is that glorification of violence or weapons could conceivably work without direct hate towards a specific group (so not covered by existing rules), but still have adverse effects.

Since i have no moderator experience, i cannot say how hard that would be to enforce without going overboard, so i am asking if anyone with moderation experience can weigh in here. Would it be a heavy burden or a helpful addition?