It's less safe for bicyclists to stop because they have to dismount and remount. But even less safe than that is the inconsistency. If the law was that bikes had to slow down within e.g. 50 feet of an intersection to ~8 mph, and then had the right of way like a pedestrian in a cross walk, that would be followed much more consistenty than stop signs applying to bikes.
Some municipalities let bicylists treat stop signs as yield signs, and that's also safer because it's more consistently followed.
Some municipalities let bicylists treat stop signs as yield signs, and that's also safer because it's more consistently followed.