It denies that right to thousands of people who already legally made a claim. Their human right to seek asylum is being denied.

How would you like it if you had taken all the legal steps to apply for asylum and then a government comes and retroactively decided that, "no, your application never even happened, fuck you"?

And then, let's be clear. Even if 80% (a percentage I pulled out of my ass to look "high", it could well be much less than that) of the 19,000 applications that are likely to be impacted were going to be rejected anyway, that means that 20% of them are legitimate cases. That would be 3800 people who are genuine refugees for whom Canada will just trample over their legitimate right to asylum. The MS St Louis that Canada famously forbade from unloading Jewish refugees fleeing from the fucking Holocaust had about 900 passengers, about 200 of whom ended up in gas chambers. Those 900 people are a stain in Canada's history. And now we are just cancelling the applications, without any recourse, of many times over their number. We should have learned the lesson of MS St Louis.