I believe there are some legal trappings involved - not in the actual baptism, but in having the candidates answer "yes" to the questions before an audience of witnesses.
I especially believe the question that says:
"do you understand that your baptism identifies you as one of Jehovah's Witnesses in association with God's spirit directed organization"
... is for purely legal purposes. It serves to establish that the person agreed to the term that membership in the religion is tied to association with the organization. That way it is difficult to sue the organization if a person is involuntarily disassociated or disfellowshipped for disavowing the organization.