It's a free country, and anyone can defend anyone they wish to defend. Further, anyone who chooses to do so can continue to do trades and transactions with anyone they want.
As for me, if I know through reliable information that someone has screwed people over in such transactions, I will not do business with the person. Doing so is enablement in the worst sort of way, in my opinion.
As for GameLover, my first inclination, like PuroBrat, was to believe that he was a newbie who made a few newbie mistakes. History and his pattern of conduct on one board after another has proven that my inclination was erroneous. There are reasons why he has been banned from Cigar Aficionado, CigarWise and CigarWeekly.
Just remember the adage -- if you sleep with dogs you'll likely wake up with fleas.