You'll forgive us if we don't pity you for stressing out over something so inconsequential as a message board account. Your arrogance is not a good trait in this scenario, someone else has lost money because of your incompetence and you want to walk away for free. This is your fault at the end of the day, at the least you did not use a secure password on your account and at the worst you have stolen a loan.
There are two options that I can see: You pay altcoin half of what he lost to have the account returned or have the account returned for free, but receive a tsunami of negative rep making it useless.
Oh the fucking irony. This is totally scammer logic--if you're too stupid to keep your stuff locked up, it's OK to steal it. It's his account, period. All the other whining and bargaining that Altcoin4life is doing is trying to put unwarranted blame on the scam-ee. Swingdev might have been lax, but that's the extent of the blame on his end.
Altcoin was only exacerbating the situation. In reality, there is no point of trying to sell it back to Swingdev. By returning the account, it shows good character and although 0.13 BTC is a lot of money that had been lost, it can be recoverable. It'll just make you look bad.
At least Altcoin4life is returning the account. Props to him for recognizing the situation.