Voting gives legitimacy to the clown-show of market-interfering diletants in public institutions. There is no lesser evil as by definition their tasks are of socialist nature. 

It's also not a meaningless act, else the media and political class wouldn't be bothering with promoting it as aggressively. It doesn't mather who you think you select, but that you go through the ritual itself, strenghtening the parasites' grip over your own fate.

In essence it's a coping mechanism for the blind, postponing tar&feathering and the guillotines every four years.