Why is it that a wife, intending to divorce her husband can get a restraining order against him?

Question

when there is no evidence to show he ever threatened or hurt her.

Answer 1

Generally, that would not happen.

Generally, anyone (wife or not) must provide evidence of a threat or intended harm before a restraining order is issued.

However, some states may have special laws that make an exception in the case of pending divorce -- in effect granting a legal presumption of threat from the other spouse.

Laws vary by state/country. Check your local listings.

Answer 2

they would have to have a police report or have proof and take it to court.