IMO nothing touches opiates as far as addiction potential goes. That shit becomes as important as food, water, and sex to an opiate hijacked brain.
Still, yes I think they should be completely legal. Legalizing these drugs would completely destroy the black market for these drugs and greatly mitigate deaths from shit like fentanyl and carfentanyl.
I dunno, my knowledge of those particular sports is limited so I'm not necessarily convinced they shouldn't be banned or a least heavily regulated. They are at some places.
Next thing we know people we'll come up with a pricey "riding without helmet" licence that requires people to prove they are an expert bike person or something. I don't really care as long as it decreases the incidence.