Voles will infest your place and being nice with them makes no sense because they don't understand nice.

"Meadow voles can carry a variety of potentially serious human pathogens. Toxoplasma gondii, Trypanosoma microti, rabies, Hantavirus, and Korean hemorrhagic fever are a few of the potential disease agents that have been detected in meadow vole individuals."

Also, females can have a dozen litters a year. Ain't no such thing as having one vole in the house. Either trap them and relocate them a mile from where you are or kill them with mouse traps.