The passing of this law is because the country is run by a handful of robber barons. Not all wealthy people are stupid, but all robber barons are.
Murder (this is infact murder and not suicide.) is a cheaper option in the short term. Plus, it'll have a good effect of being able to just kill off political problem causers. Which we've already seen starting to happen.
With regards to the handwave? It's because Canada perfected their propaganda of being "nice and harmless and polite". Canada is absolutely a dysfunctional nation, but it's criminal oligarchs make enough money to hide that from people outside.
It should be very relevant to you. It's a slippery slope, and it won't be ending with people who are actively seeking it out. It will, and already is being, applied to inconvenient peoples.
As well as just, random fuckers. If allowed to spread, it's going to get to a point where posting something on agora road is enough to get you "signed up for MAID".
WRT the last point on God, the thing you're misunderstanding is that people who seek it out often believe exactly that.
This includes many many western religionists. Monotheism is often nihilistic after all. Especially within protestant context.