Exactly the reason I don't have a more accepting attitude when it comes to left wing positions I might actually agree with. My political disagreements are what they are but the idea of providing any validation to what amounts to Bolshevik-style tactics keeps me on the sidelines.

As an example: I am a free market libertarian who agrees with marriage equality, but the means by which 'activists' attempt to engage issues turns me off. For example, harassing Mike Pence at his house -- I found that tactic childish and off-putting and immature (and divisive) as well as ineffective. Those tactics don't create positive change, they promote Balkanization of people who might otherwise be convinced to agree with a reasonable position.

France's violent anti-Uber protests -- regardless of issue, I'm less likely to listen to potentially reasonable positions when they are presented in violent or disruptive ways. In fact, those sort of things make me less likely to consider their views.

When a child screams for chocolate -- that's less compelling than if they ask in a reasoned, mature way, presenting facts and arguments rather than throwing things and parading around the house in perpetual outrage.