In TF's above post, you will see that he seems to have admitted to having at least 1000BTC of his own money as of 2016. This is not the same as him admitting to stealing money from his customers, but it does show that he did not use all available resources to repay his customers when his site was "hacked".
Good observation, PrimeNumber7! Perhaps he needed more those coins for impressing Internet chicks than paying back his victims. After all, our main role, here, on Earth, is to perpetuate our specie. Perhaps, TF is very interested in reaching humanity's main goal (which should be a noble act (/s) ) and, for that, he used the coins in impressing such women hoping that he would also be able to perpetuate humanity. The other people's loss was, probably, less important for him.
After all, what could matter more? Having an offspring or paying back a debt? Let's be reasonable here.
(P.S.: I hope you noticed the "/s" I wrote above.)