Greed isn't that negative of an attitude. Although it is mostly negative at times (if it goes overboard), it can be actually helpful sometimes, so fully blaming Greed isn't entirely correct, but it isn't entirely wrong either. Risk management plans are in the end, just plans, and plans are bound to change IF and only IF someone actually understands how the market works.

 There are times that you need to trade even though your plan says no all because of the fact that there's a chance and a high one at that. IMO, most mistakes that actually happen in trading is because the trader fails to understand the movements, well I mean, no one does most of the time but I'd say that he was just unlucky it didn't go as what he planned. IT is important though that he could minimize any losses that he got from changing plans though.

Also uhm, OP your BTC profile link in your linked post doesn't work. Just sayin.