I think you are drastically misinterpreting "RP Friendly" with just "Friendly".
Vampires are not friendly, and security should brig 'em. Vampires are, however, not obligated to be murderbone-y or thrall on sight style antags. You cannot summarily execute them just because they are vampires, just because players murderbone as an antag a lot, You may as well commit Greytide genocide cuz they are almost always shitters, using that logic.
You can (And should) absolutely throw them into the brig and throw away the key. If the vamp gets out for being fully powered up an just misting away, then execution is on the table, because it is no longer viable to contain the threat.
Just killing antags outright for being antags is one major way you get boring, non-eventful rounds where nothing happens for 85% of the station's crew, because Security wants "Dat sweet red text" on antags.
Conversely though, a soul-less bureaucratic hyper corporation, so large it functionally has it's own military and black ops squads WOULD want this teleporting ultra strong entity for scientific study to apply for their own forces or for possible methods of controlling them, even at the expense of "expendable" crew members, that DOES seem very much up their ally, especially if it pushes the company's profits higher then their competitors, no?
Was that not the entire basis of the "Alien" universe? Aliens were scary shit, but companies wanted to control them, thus leading to terrible scenarios for the grunt levels?