I can fly say a longranger after finishing my ppl in a robbo without any further training or endorsements
Are light helicopters falling out of the sky like confetti in the US due to people being allowed to do that? Or are pilots (and aircraft rental companies) more sensible than that?
Unfortunately, idiots will kill themselves and other people no matter what the regulations say. In any field - a rider passing a motor-cycle test on a moped and jumping onto some kind of super-bike the next day, an inland-water dinghy sailor taking a sea-going yacht out into heavy seas, or a pilot jumping into an aircraft they haven't flown before with 6 friends and expecting everything to be exactly like an R22.
Regulations don't stop idiots, any more than laws stop criminals.