What I fear is the possible litigation if a child is injured playing in the yard. 

@Michael Plante my concern with this is that your tenant doesn't have any business insurance to do the work they will be doing, so if they get injured doing the job, or someone gets injured because the work they didn't wasn't up to par it falls back on you.

Meaning, if I don't buy insurance and I get injured, I will owe the hospital out of my own pocket, AND I will owe the government.Maybe this is selfish, but where is the benefit to (uninsured middle class citizen) here?

I am not heartless either, injured and abused animals always pull at my heart strings.

In fact, for one of my rentals, I found it cheaper to pay for the preventive removal of a sketchy tree on my neighbor’s property rather than wait for the tree to fall on my house (and risk the tenants getting injured).  

If someone gets seriously injured on your property and decides to sue you, you are NOT covered.

In California you’re better off with an unlicensed contractor unless someone gets injured, then you’re in trouble. 

If they make an attempt they will probably injure themselves, setting them back further and worse discouraging future attempts.

Sure, a lucky few will equip themselves on the field with guns they stole from the enemy, and a lucky few will be able to rise to the ranks of generals, but for all that weren’t lucky might either get critically injured or killed by all of those who were taught the basics of how to fire a weapon, work as a team, navigate in the field, and learning .

A firearm is 43% more likely to injure/kill someone you know than actually used in self defense.