I believe Singapore has a policy that anybody breaking SARS quarantine is subject to either a jail term or $5000 fine.
Quarantines need to be enforced in Canada and elsewhere. They should be mandatory, not optional. To not do so can be deadly for others.
At the very least, Hong Kong and China should be and should already have been quarantined.
Now, the virus is in many countries. And it's impossible to undo this one. International business travel is no longer necessary with the advent of video conference calls on the internet.
If this isn't as much as it's being said to be here, it's a good preparatory model for the real thing.
We can't worry about the effect on tourism or business when the issue is about a possible epidemic and many millions of deaths.