No, he's just into utterly ruining peoples lives, killing people that are important to him because he believes their ideology is wrong, and generally just being a total prick.
I'm not saying Leloushe is a saint. But, every time he's ordered someone to kill themselves it has always been "one shot, one kill, no mess". They all die from a bullet to the lower brain, instantly killing them.
I don't know about you but getting someone addicted to a drug so you can use them to do you bidding is much more devastating than simply dying.