Are Canadian politics dominated by money like American politics are? If they are, that could explain at least some of what you've noticed. In a system where money wasn't such a huge factor needed to win elections, I think we would see a lot more people who genuinely wanted to help people run for office and win. The problem when you introduce money as such a major factor to win is that unless the candidate is already independently wealthy, they will have to kowtow to wealthy people and money interests in order to win. A system like that will select for people who are willing to compromise their principles for money, even if they deep down would genuinely like to help people.

I've thought about this occasionally, and feel that it's a tragedy that there are probably many politicians who get into it for the right reasons but at some point (maybe from the start) compromise that by justifying that they can keep helping people even if in some minor fashion if they go along with this.