Of course. But the primary argument for legalization of prostitution (I'm not advocating it, just stating it) is that it is prostitution is less dangerous if legalized and regulated to include regular health checks, licensed brothels rather than prostitutes hanging around street corners and so forth. Legalization of some narcotics (again, I'm not advocating, just stating) can be justified on the grounds that controlled availability helps prevent poisoning from impurities, infections (including HIV) from dirty needles etc, and that it would reduce both organized crime and associated violence (dealers) and petty crime (addicts). In the case of hard drugs, availaibility is only suggested for existing addicts. In both cases, the essential point is that legal or not, both will happen anyway.
Like most moral issues, that's one of opinion. I wouldn't necessarily disagree if the second referred to the method of slaughter. I would if talking about slaughter period.
I think you have missed the point here. Neither of us were referring to physical 'sickness'!
As do I. But, again, the argument would be that regulated legalization in fact protects such girls. Let's not stray further off topic, though. This one is about killing animals, not prostitution or drugs.