Here in the UK the problem is substantially a structural one. First-past-the-post elections and the lack of a legislative revising chamber with a democratic man

Here in the UK the problem is substantially a structural one. First-past-the-post elections and the lack of a legislative revising chamber with a democratic mandate result in governments having very little restraint on their powers. This tends to result in bad laws, which often pander to the worst instincts of the governing party's membership (see: "something must be done"). Because we have no written constitution, and because it has recently become apparent that the precedent-based system that we have instead is much more bendable than was previously thought (see: brexit), governments can pretty much do what they want. And they do. And this kind of "strong government" is actually quite popular with some people, particularly on the right at present. I don't know about Canada or Australia, but at the national level I believe their systems are at least partly patterned on the one they inherited from the UK.