All this positivity can make one a little reckless.

If the tenant can come in to your house, recklessly disregard the terms of the lease, and walk away with 10k in cash, its mildly infuriating and I'm sorry if you've had to do that.

@Joey ParkerPeople with a pile of cash will tell you it's reckless.

And now you, intentionally or not, endorsed this reckless approach. 

Now that doesn’t mean be reckless.

Let him know (in writing) that his reckless behavior put the property and human life at risk.

@Robert Wiltshire sounds like the current owner is a bit eccentric and reckless, it may take time to fill the park also, set the space rent to what others in the area are charging to remain competitive when you decide to sell the mobile homes, you might even be able to get yourself an almost paid off park if you are able to sell off all of the mobile homes which are depreciating anyway.

But that was a risk that I was willing to accept as we were up against another offer.However, unless you have actual cash in the bank, waiving the financing contingency is just plain reckless. 

Here goes:1) Work smarter, not harder.2) Don't buy liabilities that go down in value; buy assets that increase in value.3) Don't work for someone else to make them rich (W-2 employee); work for your self (i.e. own a business).4) Use other people's money to buy assets.5) Get creative (some would say reckless) with deducting standard expenses as business expenses. 

For instance if you personally acted fraudulently or recklessly, you may be personally responsible.