With two children (my heirs) and multiple units, I am harmed by Prop 19. 

If one state comes out with some really harmful policies, you can hopefully weather the storm if your investments are spread out.

If so, then if the decedent didn't set up the LLC correctly, which happens all the time, gifting LLC interest could be very harmful. 

There is of course the valid argument that when buying this way, you could harm the seller in the event you did not make the payments.

First, do no harm is officially out the window. 

I don't necessarily agree with the position, but if the objective is to collect the $30,000, it can only do harm to the contractor's business which is adverse to Kevin's objective.

You don't understand the process of "wholesaling" (presumably you mean assigning a contract) based your question and jumping in with both feet only harms your reputation before you even have one.

Because this is a perfect example where you could offer them to get out of the lease, no harm, no foul, by 30 days and they can go find a perfect house with no smells, bugs, silent dryers, perfect fridges etc.

They suffer no harm, you do.

Like anything the agreement and lease terms can protect or harm you.