It's just someone who didn't learn anything from his past mistakes and there are almost everyone had that phase but this worse is really disturbing, imagine being in his shoes.

When you make hell lot of profit that you'd not happen again, then just cash out the profits or at least half of it then reinvest it into a different asset which doesn't necessarily to be a crypto, it can be anything that has a different risk/reward ration. Single point of failure will do nothing but exactly this.