Greater speed is probably the most obvious answer. I have also seen sailboaters do plenty of stupid things on the water..they just don't do it as fast.
It's also a fact that sailboats are generally pretty much just for pleasure and many power vessels are for commerce. Perhaps 1/4 to 1/3 of those vessels were commercial
boats simply have much more time underway since they don't sit at the dock
all week and maybe once a month get underway on the weekend.
It's implied here that sailboaters know more than motorboaters. Not in the commercial world with people who do this for a living.
If one wants to compare a sailing yachtie to a motorboat yachtie...then sure, the sailor probably knows a bit more...they have to. As far as doing dumb things though...it's about a tie from what I have seen from a commercial guys perspective.
When I hear five blasts it is invariably a sailboat about to get run over by a ship where the ship has rights. The examples are endless.