If they refuse to move out, evict through an attorney.When I tell tenants to leave because of lease violations or criminal behavior, they read the writing on the wall and move out 80% of the time. 19% will stay the full 30 days, or close to it, and then move out.

The neighbor who is living there has developed a pretty bad mental health issue and has become very erratic and displaying violent behavior even threatening to kill me and my tenant.

Tenant therefore agrees (a) torefrain from any behavior which is loud, obstructive, rude, offensive, boisterous, or disorderly; Any violation of this paragraph may, in Landlord’s sole discretion, be cause for termination of the Lease and or Tenant’s tenancy."

I determined the property characteristics that attract the segment with the behaviors necessary for a reliable income.

Never EVER accept or agree to accept any tenant without properly conducting all points of discovery and creditworthiness [ability to pay], background [character] data [patterns of behavior in past residences], etc.

I suspect that is driving some of the behavior you are observing.  

You can't conclude that Nike's shoes are worthless because no one engages with Nike's ads when they are displayed in front of people without any legs.

Usually when there's behavior like this, from VRBO or other companies, there's a stretch and they have already knocked on the door of consolidation via acquisition(say booking or airbnb).

I will take these comments and start focusing in on the display.

Thanks @Carlos PtriawanLooks like the link does not display correctly; but I did not get a message from admin, so here it is again for reference.However, you can always look it up on YouTube/@MarcusMKE and this one is called: Where are Milwaukee Home Prices going?