I'm not, I'm just generalizing the stance to whether people have a responsibility of "preventing future crimes" when considering whether to offer services to clientele.
You are though. You seem to be claiming that in general there is no moral imperative to try and prevent any crime. But that misses the point that the harm from some crimes is greater than others, and that there may be a moral imperative from preventing potential quantities of harm, irrespective of whether or not something is criminal.
