Canada

That's a pretty unfair characterization of the situation.

1. Rates had been low for quite awhile. Will the rate eventually go up? Of course! But people can only guess when.

2. We're required to consider the possibility of rates going up (the stress test), but I'd thought that for some borrowers we're already past what they were stress tested against.

3. For many, this period of low rates felt like their last chance to get their foot in the door. Whether rates went up or not, it was looking like the barrier to entry (either price or mortgage eligibility) were going up one way or another. You either wait and risk never being able to buy a home (or at least not in the location you want), or buy and risk rates going up. Might some people lose that gamble? Yeah. Pretty easy to understand why they took it though

without considering the possibility that interest rates would go up

More likely they did consider it, but when the BoC explicitly stated that they would not raise rates...

Many people bought homes they could afford, that they needed to live in, after passing a very conservative stress test because that was the way you are supposed to buy a home. Nobody expected the interest rates to more than double in a couple of years. It’s unprecedented. Nobody expected our government to do absolutely nothing about inflation and leave it all to the BoC to fix. You are vilifying and generalizing an entire class of people, most of whom do not fall under the cherry picked description you offered.

Repeat after me: most homeowners are regular people who borrowed responsibly under stringent criteria when they bought their homes.

We need less people controlling the money printers and interest mechanisms in my personal opinion. Some of these changes is reactionary to the USA devauling their own currency through exsesive monintary sepending, which is now uncapped till 2025(since being uncapped their national debt has increased by 1trillion dollars now ~32 trillion). And since our economy and most of the world is tied up with the USD its now causing problems. There is sestemic issues in the central banking systems that we use today(fractional reserve banking) and they(the issues) have been exploited for too long. I believe the next viable solution is a decenterilized finacial system and to take lobbying for policy influnce out of our societies. Seperate note billionaires need to pay taxes, they sequester more wealth then smog from lord of the rings and pay less tax then you reading this. Any got to head back to my behind wendys shift, want to see even more under the stock markets fuckery visit whydrs.org or drsgme.org(warning rabbit whole)

I wouldn’t be opposed to giving BoC some control over taxation

Why not just raise taxes, then?

I think that would be a better signal. After all, the poor who drive consumer inflation aren't given loans and thus don't feel interest rates directly. Interest rates only directly impact the rich who can shoulder increases for quite a while. And only after they've been feeling the pinch for a while will they start to cut spending where the poor are found. It might work eventually, but it is not a quick fix. Taxes can directly impact even the poorest among us right away.

But, of course, the whole reason the central bank assumed the inflation target mandate is because tax increases don't sit well with the people. It is easier to have a "We tried nothing and we are all out of ideas. It is the central bank's problem now." scapegoat in the BoC. Giving them some control over taxes would defeat the purpose of them having the inflation target mandate (a mandate that only goes back to the 1990s).

That said, the BoC has a quantitative tightening lever they can use, in much the same way taxes could be used, to reduce liquidity. They are actively using this lever. Interest rates are not the only knob they have.