Many are not so loud. The issue being confirmation bias in noticing them.

Sure, the activities listed are different. But they were not meant to be exhaustive either. Merely to demonstrate that "save lives" is not the one true rule for decision making.

As you allude to in your first sentence, it is about risk management.

Managing little risks (will loud bikes upset someone?) and big risks (will people die doing this?). The issue with risk management is everyone has their own perspective on it.

So then the question comes as to what the balance is for society. I'd argue that "affecting others" is car accidents more than motorcycle noise.

Mind you, I'd be happy with more policing around loud bikes AND cars.

Let’s be real, the vast majority of motorcycles are loud nuisances and it’s the most dangerous mode of transportation, statistically less safe than plain cycling despite how often cyclists are endangered by cars.

“Many are not so loud” is kind of like saying “Not all mac and cheese is unhealthy.”

If the issue with risk management being that everyone has their own perspective on it…well, that was my perspective on it.

I think life would be better for most people if motorcycles were banned.

I don’t think the same thing about scuba diving or rock climbing because those activities don’t affect the rest of the general public in the same way that transportation infrastructure and common ambient noise does.