I've seen plenty of lacerations, but most appear to me to be of the band-aid or small amount of wound glue type. Do they suck? Yes. Is it okay for them to happen? No. I wasn't taking issue with the premise, just the proposed level of injury a bird that size can do.
I've done numbers on myself that, if I were a run to the ER/clinic type, would have definitely required stitches!
There was a case a year or so ago in England where someone lost control of their drone, it struck a small child and ended up in the loss of one of the child's eyes. Really tragic, no question, but probably close to a "freak accident" type of scenario. I think death/broken bones type accidents would be similar. Severe lacerations type accidents are certain possible, but given the amount of drones already sold and the scarcity of reports already, probably generally rare, at least involving bystanders.
I may be being optimistic/naïve, but I'm hoping the drone fad has, or is pretty close, to passing. I just don't see them in the news daily as we did a year or two ago. We're not seeing weekly reports from airline pilots who heard from a passenger's uncle's first cousin's brother's wife that they saw something out the window, and determined beyond all doubt that it was a drone, and only missed being ingested by the engine by 3cm, all at 38,000 feet AGL!
If things remain calm and quiet, all these regulations will look more and more like overzealous knee-jerk reactions. If, as Pyrate, some idiot proceeds to severely injure someone or fly into an airliner, you can be sure lawmakers will go to town.