What if they wreck your property, don' t pay rent, etc.

Fix yourself, before you wreck yourself.

., wow, what are the odds of each and every tenant being a wrecking ball?  

One client I recently worked with had his wife go from nervous wreck to rehab junkie.

The house was a wreck!

What if you get sick, in a bad car wreck, your spouse divorces you/girlfriend dumps you, your kid causes an accident and you get sued for $10 million.... how do we deal with "life" when it happens?  

Please.Without getting to far into the weeds, We've recently purchased a little Mixed-use building in downtown Phoebus (Hampton) VA.It’s a cute little wreck, and will need EVERYTHING, including infrastructure.

As @Frank Maratta noted above, thorough screening can help weed out the serial wrecking-balls, but some people are always going to lash out at a perceived slight or out of frustrations that you may have nothing to do with. 

If the tenant was a good tenant anr didn't wreck the place I wouldn't make an issue of it. 

A bad deal can be salvaged by good people, and bad people can wreck a good deal.