They’re arguing the right to euthanasia right now in Canada Parliament and court and the only argument I have heard really against it is ‘God is supposed to decide’ and ‘well we’ll have 100,000 euthanasia’s a year!!!’

So basically religion and slippery slopes are all you...

The only viable point against euthanasia I have ever heard was that it puts undue stress on the elderly, particularly in resource-poor setting, to end their lives over treatable conditions just so they wouldn't become a financial and/or personal burden on their families.

Though that would easily be remedied by widely socialised healthcare that also includes the payment of care-personnel for the elderly, so that the families don't have to build their lives around them, and improved investments into palliative care.

Basically, the discussion about euthanasia is the same as the one about abortion: Both of those activities would only occur in neglible amounts if we were willing to invest a little bit more money to improve people's lives. And the only reason why there are debates over both of these things is because it is simply cheaper to outlaw them in order to make them go away (only, not).