Well, the US isn't (usually) threatening to take Canada.

China has been wanting Taiwan for decades and now reasonably has the capability to take it.

It's not about what's "right" or what's "allowed". Those are squishy concepts.

China is gearing up to take Taiwan by force. Who is going to stop them? Maybe Taiwan itself. Maybe the US, too. Maybe others.

A war like that would be horrible. On the other side of the coin, I think China may have a lot to offer to a friendlier Taiwan.

There are hard decisions to be made.

You have to consider your choices carefully, even if you don't like any of them.

FWIW, I am not Chinese and have no relationship with anyone there.