I don't have any hate towards Sadler for flipping really. It wasn't a wise move as for his own safety is conerned, but he wasn't a drug dealer by nature as has already been pointed out. From the articles about him it sounds like he's someone who was a bit lost, made a wrong decision while trying to find some excitement.
I do however have a strong feeling of dislike towards DPR, for his part in the 3 moderators being arrested/extradited. Those guys were only making $50k a year while DPR sat at the top making millions, yet now he's co-operated there is a possibility he might even get less time than them.