The goal of WANTF is not to get to the drug kingpins in order to get drugs off the streets -- the goal of WANTF is to make as many arrests as possible (since their funding is based on their number of drug busts -- big or small -- and asset forfeitures). Indeed, the officers of WANTF do not want to get drugs off the streets completely, since that would eliminate the need for a narcotics task force (which would eliminate WANTF's funding).
Seeing The Expose Narcs Equation along with knowing the motivation of WANTF (quantity of drug busts, not quality of drug busts, is what's important) will really put things into perspective for you, since you'll understand exactly why WANTF exerts so much pressure on people to narc.
The officers of WANTF are not righteous fighters trying to get drugs off the streets. Instead, the officers of WANTF are looking out only for themselves, but they hide their true motivation with an act of virtuousness, when in reality they are willing to sacrifice the lives of college kids and people who are truly in need of help, for their own selfish reasons.