okay, well that guy won an election so clearly it's possible even without sortition. If people are picked at random then the likelihood of getting some wacko is lower rather than higher, because wackos are more highly motivated to try to act on their wackadoo policies and because of the way voting is implemented, that wouldn't really be a problem for them because it no longer appears to be disqualification for a politician to be crazy, and the crazy ones are the ones who run. On the flip side, the actual rate of totally crazy people across the entire population is likely to be smaller than you expect and random selection would represent the underlying rate of wackos in the public. If it turns out that the rate of wackos is so high that like, 51 percent of your legislature is hearing voices in their head and living like Diogenes, then representative democracy isn't going to help you either.