Do we need a war on drugs? I don’t think so. We just need a war on people making services unpleasant.
Asking someone to leave a subway platform because they are not using the public transportation system for transportation is not a war on drugs. It’s just making people exit a subway station.
It is a problem if, no matter where someone is, they are always asked to leave that place. At that point you cannot special-plead the subway system.