On the first thing... you don't... but some people do... those guys you hate, who's shows you don't care for, do exactly that... all three things. My point isn't that all people express self-interest through aversion to competition, just that some people do and it makes sense that they would. However, I know that wasn't your only point with the first thing. The other point relates to the second thing, and is actually more important to illustrate my point about the value of "life".
"Life" isn't necessarily what we value. We value community, relationships, friends, family, identity, traditions... that kind of stuff. That's what the lawn-burning-thing guys thought they were protecting and on the flipside, that's also what your area farmers were protecting when they stepped in for your dad, even though he was ostensibly a competitor. They valued their livelihood, but they valued their community more.
So that is the ultimate point. Saying that we need to value life misses the mark, and tries to shoehorn in religious ideology where none is needed. We value our communities, our friends, our families, our relationships, our interests, our identities, our ideologies and ourselves. We don't "need" to "value life". Saying "we should value life" is an unnecessarily overbroad claim that is really just an attempt to disguise the very specific "we need to ban abortion cause its against my religion/ideology" as some sort of lofty all-encompassing universal principle.
So it's the religious explanation then? Fine. My response to your post is that we don't need god to value other human beings. But that value has limits. It is not unconditional ... See my above response to FarmBoy. What you are attempting to do, is make the overbroad argument about the unconditional value of life (which you don't even truly subscribe to) for the specific purpose of opposing abortion. If you want to oppose abortion, just oppose abortion because its against your religion, that's a perfectly legitimate reason. You don't need to keep rethinking new euphemisms for "the sanctity of life" concept. The only point of the euphemism is to force your religious principles onto others, because its Unconstitutional.