You seem to be saying, in essence, "except for the drug dealing he is a pretty good kid, so therefore he is a pretty good kid."
Not quite. It's more that I'm saying drug dealers aren't just drug dealers. The people who sell drugs are rarely more or less scummy than other people. Saying you want to kill them for drug sales is ridiculous, and it's vilifying a lot of people who are more than just drug dealers.
"Um, what if you include the drug dealing into the equation, and all of the possible damage to the lives of people he is selling drugs to, or perhaps even to their friends, families, and loved ones?"
If it's their choice to buy drugs, then if he wants to peddle, he should peddle. (I honestly don't know what else he sells. I don't buy drugs at all, so I've never asked.) You can argue over whether or not drugs are good for people, if they help them relax or if they're burning people out, but in the end it's the choice of the people who want to buy the drugs. And there's some complexity to that argument - I think that the only meaningful things worth doing are the things that actively help people, but that means that I dislike people who write slush stories or directors who are sloppy with camera work or pretty much most people, if I'm going to stand absolutely by that metric. But that's not a reason to incriminate somebody. It's their choice to sell and I think they have that right.