I’ve also found out through my inherited tenant as well as his girlfriend (when she got pissed at him for him cheating on her) that he was renting out one of the unit as a flop house for people to do drugs in all this time since September.  

Morby and others wrongly say take installment sale tax treatment on the sale on a wrap. 

Treatment by shareholder of corporate assets as own.5.

Come to find out they seized the property as it was involved in a drug trafficking ring.

Or, is it because I don't want to visit a city where it's unsafe because they ban police from doing their job and I probably will get robbed, harassed and be exposed to crime, disease and drugs.

Quote from @Aleea Stanton: Had he been on alcohol or drugs? 

I've even had great tenants for 5+ years and then something changes in their life (drugs, dimentia, divorce, etc.) that causes their life to fall apart.Inspect at least once a year.

Proc. 2002-69I found this guidance and thought I would provide a summary:It was issued to remove uncertainty surrounding treatment of an entity owned solely by a husband and wife in a community property state.Essentially, if that entity is a "qualified business entity", and the husband and wife choose to treat it as a disregarded entity, the IRS will respect that classification.On the flipside, if they choose to treat it as a partnership for Federal tax purposes, and file a partnership return, the IRS will accept that the entity is a partnership for Federal tax purposes.A business entity is a qualified entity if:1) The business is wholly owned by a husband and wife as community property under relevant laws,2) No person other than one or both spouses would be considered an owner for Federal tax purposes,3) The entity is note treated as a corporation under Reg. 301.7701-2

Here is a treatment for you and this will sound opposite to what everyone else is telling you here: what you are experience is burnout, seeing so many success stories around you (I call them toxic motivational stories) but they aren't you discourages you. 

Keep in mind that it is always your responsibility to know the zoning, permitting, condition o fthe foundation, roof, electrical, plumbing, lot lines, chain of title, neighborhood, crime rate, drug houses, etc before you agree to buy.