If the smug style can be reduced to a single sentence, it's, Why are they voting against their own self-interest? But no party these past decades has effectively represented the interests of these dispossessed. Only one has made a point of openly disdaining them too.

Abandoned and without any party willing to champion their interests, people cling to candidates who, at the very least, are willing to represent their moral convictions. The smug style resents them for it, and they resent the smug in turn.

South Park called it long ago in "Smug Alert".