Look it's not rocket science, we all live in a society, we all have to get along. Some behaviour is deemed anti-social, and we have laws against it. We rightly stop people littering and we're don't hear wails of entitlement from the pro-littering lobby! If we did we tell them to shunt off, once we picked ourselves up off the floor from laughing at them.
Now I am not going to rely on facts and figures supplied by this or that biased group, I am going to rely on common fucking sense. I am fortunate in that I have a pretty extensive friendship circle, which includes many female friends. Not a single one approves of prostitution, and would view any situation where that was the only option as pretty bloody bleak.
Women on here seem to echo the trend I find in my real life, and to be perfectly blunt that's a good enough reason to have it criminalised. We are a society and how a significant portion of that society feels on an issue should not be dismissed, even if you happen to disagree with it. To say nothing of the fact that a majority of men do not use prostitutes, so it's not even an issue men are all singing from the same hymn sheet on either.
I would find a lot more sympathy for the pro lobby if the argument was along the lines of "yes we're pro prostitution, yes we're aware many women are engaged in it are in desperate straights, and no we don't want this state of affairs to continue, so we support this and that initiative to alleviate this. We're going to campaign for regulation making safety the absolute priority etc etc" Oh and for good measure "we are not going to hold up men who go on to have sex with shaken, worried and in tears women as some sort of moral exemplars"
As it stands the case so far seems to boil down to "some women choose it, I am not going to examine the landscape around where that choice is made in any way shape or form, so I am going to continue doing it, and la la la I'm not not listening meanwhile everyone listen to me....". In summary you are not winning any hearts and minds here.