It actually depends on the person and nothing is wrong with it since its his choice, our opinion doesn't matter because at the end he will be the one who will make the choice. Most of us are stress by just looking at the price, no one can determine when it will rise so its frustrating but if you have long patience then you can easily handle things like this and if you your own strategy when things like this happens.
Right, everyone has the right to do with their bitcoin anyways, whether it's Steve or an average Joe like the rest of us. He also doesn't need to prove it.
Also remember that he reported losing 7
BTC to a scammer,
https://www.ccn.com/apple-co-founder-steve-wozniak-lost-7-btc-to-scam-artist-with-stolen-credit-card/. So maybe he really dumps it to cover what he has lost.