Almost impossible not to sin:
When we:
1. walk, we crush bugs and microbes.
2. eat we hurt animals (unless vegetarian) or plants (which might feel pain or react).
3. protect from crimes, we hire cops with guns (some hurt Blacks), or kill in wars (God commanded "thou shalt not kill.") Should we have obeyed God's order not to attack Iraq when we "thought, incorrectly" that they were involved with terrorism? President W. Bush thought that we were sitting ducks for terrorists, and thought that we should attack them on their soil before they attack on ours. Torture camps were thought to induce knowledge to capture terrorists and save lives. It is easy to step over a moral line and sin.
The best we can do is:
1. prevent loss of species (but not use the argument that there are plenty of a species so it is okay to kill or hurt them).
2. protect God's environment (avoid fracking, drilling offshore where spills seem inevitable, oil pipelines which act as super-highways for predators to move quickly, etc).
3. to be humane (rescue dogs....but dogs eat cow meat, so saving a carnivore to hurts a peaceful herbivore).
We save a poor caged parrot from his cage jail....toss it into a forest and say "you're free....wheee.....you're free" then a hawk swoops out of nowhere and devours it whole. Perhaps zoos keep species from extinctions? Perhaps cattle ranches (which butcher cows before they are one year old to keep the meat tender and not waste money on feed) keep the species alive?
Hunting clubs shepherd the land, making sure that the water is pure so their ducks and deer thrive. Yet, year after year, the same animals are stalked and are sitting ducks for hunters.
You raise an interesting moral dilemma about violating core principles to save life and limb, and, at stake, are our loved ones.
As a captain of a star ship, would you abandon your orders to save billions of people on a planet in order to save the one and only person that you love? Dr. Who dealt with that very dilemma, and the answer (for him) was that some things are too precious to us to abandon, even if that means the destruction of the universe.
These are the moral issues that we should discuss today, so we are not hit by a sudden decision and weighty issues. Yet, we won't know, until we are confronted with these issues how we will decide.
Will we be brave and save our spouse if kidnappers hold us at gun point? Will we willingly die to save our beloved spouse, knowing that living with the guilt of watching our spouse die might be worse than death, and knowing that our death would equally harm our spouse?
We are not perfect beings (though some are close to saints). This is not a perfect planet, it is filled with pitfalls, dangers, and temptations. The bible teaches us to not give in to temptation, and that there "might be" a better world awaiting.