But that's no reason to take a critical tool--no-knock warrants--out of the hands of the large number of good, honest, dedicated officers who simply want to nail bad guys before they have the chance to flush all the evidence.
Only user amount of drugs and small time dealers (usually those that deal to support their habit) can be flushed. Dealer quantities of drugs are to large to dispose of quickly.
Besides that, drug users and even dealers engage in consensual "crimes". They are not murders, thieves or rapists whose targets/victims do not consent.
It is against the law, therefore a crime. Why put crimes in quotes?
You're joking, right? Do you honestly believe that the drug business doesn't involve any other crime than the sale and receipt of the drugs? You've got to be kidding.
Do you think police agencies dreamed up no-knock warrants just because they like to bash in people's front doors? They exist, and the overwhelming majority of people support them, because critical evidence was being destroyed before officers could get into the building. It's not imaginary, it really happens. It happened a lot. That's why they created the no-knock warrant.