Superbly written, I fully agree! Trekking poles don't belong on the Hanz path to Mojstrovka, but helmet on head is obligatory. Especially at the entrance, some stone often flies down.
Sending this to everyone to read:
http://www.gore-ljudje.net/objave/sulc/DEMOKRACIJA_ZPP_v5mk.pdf If you see such a group that could potentially trigger rocks, better wait 10 minutes under the wall until they go ahead and thus reduce the probability that rocks will fly onto your head - or rather, you climb the wall before them and go slowly and safely. They will wait. If you do trigger rocks, then yell and warn the surroundings about what happened.
On Hanz, self-belay is definitely recommended, and there is no dilemma about the helmet.
Mojstrovka, despite being close to Vršič, is not a tourist mountain. The south approach is indeed much easier, but still not easy, and I certainly do not approve of the behavior of numerous tourists who head up in sneakers. Hanz is not a tourist walking path at all!!
Those "tourists" who don't need protection because an invisible helmet protects your head, better trigger rocks on the scree and fool around there. You will likely end up among the bushes and some branch will nicely whack you a few times as you push through, and you might realize that it's better to walk around Lake Bled.
Good luck!