"...However, we still have a ways to go to allow all voices to be heard in our communities; MPs, municipal leaders and MLAs somehow think they don't represent people who didn't vote for them and people who don't vote at all...."
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I don't disagree, but at its' core, the politicians, and their backers realize that no matter what they do, they will likely not gain any votes from those that oppose them/did not vote for them.

(think about the "core" members of any party in a riding represented by someone from another party. Do you see the elected rep from another party being able to do ANYTHING to sway those opposition voters?)

Over time, this causes them to become more attuned to shoring up their "base"...