As an aside, I find it interesting how Harrison Bergeron is so commonly misinterpreted as a satire of the left. When one considers Vonnegut's personal beliefs and the strawman portrayal of communism in the story, it really should become clear that it is actually a critique of Cold War/anticommunist hysteria. A satire of anticommunist satire, if you will.
In context, it was written at a time when the ideological and intellectual opposition to communism hadn't been very well-articulated yet, and hadn't become "obvious" to onlookers.
It might be a little on-the-nose, but I think it is a sincere takedown of the authleft (and moreso: crab mentality). These views can and do come from within the left - like Orwell, most notably.