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Not only that. You can't allow vampires to be the focus of all neutral creatures. They have low HP, only 75, and despite having quite good attack and defense modifiers, they won't withstand a large onslaught.
On the other hand, a group of 3-5 vampires can defeat almost any living neutral creature on their own, without any support. That is, they can be left to roam freely.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!