Is that dark side something that has actually happened?

It seems weird to talk about ‘making ransoms legal’ or ‘allowing ransoms to be legal by default’, as if someone has decided it. That’s not how laws work, at least in the US & EU. Laws can only limit rights, there aren’t any default restrictions.

Italy tried to make kidnap ransoms illegal, and it’s controversial, but there have been some high-profile cases of it backfiring. https://www.independent.co.uk/news/kidnap-makes-an-ass-of-it...