In my opinion if I did something that caused legitimate harm to someone else then I would be at the very least morally obligated to make the situation 'right'. 

People can get harmed and killed anywhere, it just bothers me how he told me all these things right before a deal was in the works. - If you invest into Florida, what are your tips for staying safe as a “landlord” or just in general?

As long as you disclose everything, you should have no problems.In my opinion, a real estate license is helpful instead of harmful.

I personally don't see the harm in getting positive cash flow even if it's smaller because at the end of the day it's still paying down the mortgage.

If it fails then you back out no harm no foul.That may seem unfair to the seller, but it might also result in them being able to sell for a higher price than they could have otherwise.

I'm thinking that there wouldn't be any harm besides maybe following up too much with them if I did both at the same time.

Does it harm your credit if you do more then one loan pre approval at the same time?

A tort is a civil wrong that causes physical or financial harm to another.

Even if it was in violation of the lease for the tenant to change the locks, if I get the keys, no harm/no foul in my view.If I am not getting the keys, that probably means the keys are the least of my worries - legally or condition-wise.Exception: if I weren't already evicting (or the tenant wasn't already vacating), and if the lease wasn't near the end, and if the tenant was troublesome but paid on time, then I *might* use the change of locks as an excuse to terminate the lease (if the lease allowed me to do so) and then serve the tenant with a 30-day notice.  

Reacting to bad tenants, threats, or fear, will cause you more harm then if you sit back,  implement your lease agreement (according to the laws of your state), and let the courts do their job.