Yes, many things have the power to kill you. No doubt. Being alive means that you risk death every day. You can breathe bad air, suffocate, get hit by a car, have a tree fall on you, get bitten by a poisonous snake, blah, blah, blah.
Yes, I *do* think that you should respect these things. But I would have to fine-tune what I mean by respect.
In terms of people, I would intend it to mean that you acknowledge the fact that your opponent has *some* degree of skill or ability--even if they are not top of the heap. Pay some amount of homage to the fact that they, too, have been alive for some time, and they have learned things, had experiences, and built their own little "treasure pile" in life--they have things that they can teach you, one way or another. Every man/woman can teach you something, somehow. That, in my opinion, is worthy of even a nod of respect.
For animals and nature, I think respect means just the simple awareness of their life as well. If you know there are poisonous animals around, don't go running into where they hang out. Give them room and don't poke at 'em, and you won't get bitten.
Cars and stuff like that, same thing. Don't run out in front of them, don't do stupid dangerous things. Respect means just being aware of how to be *smart* when dealing with them.
This is just a brief overview; hope it makes some sense. No, I don't think you need to bow to cars or snakes, or stuff like that. However, I don't think you need to be stupid in dealing with them, either.
Okay, I'll stop rambling before I go too far...
Peace--