It's a serious crime; it's not a violent crime. You don't see the cops busting down doors and charging in with riot shields and shotguns to catch your average white-collar fraudster, even though fraud is also a serious crime. This level of violent entry can only be justified by a reasonable belief, founded on evidence (which the police refuses to produce), that the suspect will be violent.

(As an aside, there's no evidence that Afroman is guilty of selling drugs; that makes it even harder for me to understand why your first gut response is to think "how can someone with kids do that". There's no reason to think he's guilty, apart from blind trust in the police's word.)