My party is trying to help save some new players near us from raiders but we can't aggro them without all buying rage and they refuse to aggro us because we're clearly strong enough to beat them.
If someone in your party is illegally attacked, anyone else in said party should be allowed to aggro their attacker. Naturally, if your party aggroes someone else that doesn't work.
This doesn't affect PvP since PvPers have rage, it just lets people who aren't cowards fight back.