Now you have permanently damaged the relationship and may have opened the door to other liability i. e. self-help evictions, harassment, retaliation, etc..You screened these folks, they passed the test, you rented to them - they are human - and we are all worried about bring covid into our homes.

I mostly blame my naiveness in humanity and eagerness to get the project going.. here are many of the items (not all):All 3 HVAC units went out in the first 3 monthsBoth "high end" endless water heaters died within 6 monthsThe 1918  LEAD pipe entering the home burstSome lighting was found to be battery operated instead of electricUnfortunately a rock from DC water entered the piping which resulted in multiple cancelations and major repairsNo insulation between the upper and lower unit resulting in numerous noise complaintsPitch incorrect in back yard which results in floodingPlumbing piping incorrectly sized throughout homeAll gas lines removed and everything replaced with electric to pass city inspection easier (only house on the st without gas)Oh yeah, furnishing a two units that can sleep a total of 16 people is not easy nor cheap (especially with a puppy).

Skagway Alaska was great but lacks family ties, Southern Louisiana was fun while I was there but no desire to move back, Timbuktu was way too hot and there's no job that would pay enough for me to go back there, New Guinea was beautiful and it would be a consideration if it was more politically stable, spent plenty of time in the Amazon and nothing pulling me in that direction.

Partner with people who have the same passions for providing great housing, helping fellow humans, and building a full and abundant life.

So far we humans keep reproducing, which we will, the market will continue to follow its natural cycle.

Humans are funny creatures. 

Higher education will not, unfortunately, bestow immunity to the deficiencies of the human brain.

That physical asset fills one core human need, which is shelter.

The reason larger dogs make the top of the bite list is because when a small dog such as a Chihuahua is aggressive and bites you, even drawing blood, they're not typically reported because it's small in relation to a human. 

The human brain is evolved to see similarities and patterns in situations even when they are not there.