Upon reflection, the only sensible course is to reroute the robbers and burglars from property owners who espouse SYG to property owners who believe in reasoning and non-violence.
All libs could tie a yellow ribbon or some such to the mailbox. Nothing fancy or imposing, just a small notice.
That way, all would be satisfied.
The SYG folks would be left alone, the libs would get opportunities to show tolerace, and perps would not have so much danger in their chosen occupation.