If the police have a warrant for an arrest, they decide when and where it happens. Disney cannot tell the police to go away and come back later. And if they did, and this suspect had proceeded to commit a crime or hurt someone, Disney would have been liable. Once in a lifetime, expensive trip.... none of this matters to law and order. They are distinct and separate things. Contrary to what we all want to believe, Disney is not actually a bubble. It is part of our imperfect world. So there are security checks, ride and park breakdowns, ill mannered guests and occasionally cast members, and, when necessary, police actions.
People spending money does not change this reality.