It's worth noting that the consequences of random election are not "the crazy party gets into power". It's "the crazy party gets a couple of seats". The chances of someone with even 5% of the election are astronomically low (http://twitter.com/johnmyleswhite/status/62863260566827008 - the probability of someone with a 5% minority getting the majority over the course of 50 elections).

The likely scenario here is that your crazy party gets 1, maybe 2, seats at the worst and promptly demonstrate themselves to be incompetent tools, spoiling their chances of reelection.