Little luck, but mostly just had the cajones to say screw it, either the world economy collapses and we are all screwed and if I lose everything we are all screwed anyways, or maybe I get lucky here.

For 100 year old homes where the pipes to the city line might have collapsed or if there are large trees in the front yard, perhaps. 

I’m excited for the next collapse when everything will go on sale again...haha.

if you form an LLC for each flip, when the deal is done you can collapse and close the LLC and effectively close your liability if you ran the business right.

Then hope for one of three outcomes (1) the Government passes a lot lower tax rates or some increased deductions allowing you to “get out of tax jail” (2) social unrest leads to a collapse of the governments ability to levy and collect taxes - like in Italy (3) you die before you run out of write offs, and you purchased a life insurance policy large enough to pay your heirs tax bill.

New sewers because the old ones were too small or are collapsing from age.

Most people in their early 20's / 30's have the 2008 financial collapse tattooed on their brain and their psyche.

Within a year little things began to occur within the property - nothing too concerning - over the next 9years .... the roof collapsed in the back of the house , the neighborhood is so riddled with crime that the front of her home has about a dozen bullet holes from about 3-4 separate shootings (which the police only responded to 2).

Because I'm not sure my insurance would cover anything beyond a catastrophic collapse. 

It does and will happen especially in hypergrowth markets.I could go on and on but my point is that all of the above is in fact similar to the SFR collapse.