gj62:
You likely are doing more harm than good if you consider that any outside interference is harm, and the fact that petrochemicals are likely being consumed to transport you, fill your dive tanks, make your gear, etc. Of course, all of this has much more impact on the environment, flora and fauna of the planet than my 1-on-1 interaction with the occassional eel or garibaldi.
I'm sure you'll hang up your reg now, sit in your house, and never drive a car or boat again, because, after all, what is the help?!?
Since you two revitalized the thread...
gj62 brings up a good point. The argument for respecting the environment invites accusations of hipocrisy, because those arguing it invariably in the course of their lives do something that is not "good for the environment." They eat meat, drive cars, wear leather, use air conditioning, etc. Thus they can be branded hipocrites and their points ignored.
Hypocrisy occurs when your actions don't match your values. There are three ways to avoid this condition:
1. Adjust your actions to match your values (impossible to do completely)
2. Adjust your your values to match your actions. (very easy)
3. Have no values at all. (very very easy for some)
I choose method number one even though I know I'll never fully achieve it. I'm not going to live in a mud hut subsisting on water and fruit, but I will do the best I can. For me that means creating as little trash as possible, burning as little fuel as possible, not killing anything that I'm not going to eat, not frivolously entertaining myself with actions that do direct damage. It means having a basic respect for life, for other people and for the planet.
Chopping up creatures to feed to other creatures for your simple amusement shows a basic disrespect for both creatures. If you would feed an urchin to a fish, would you feed the fish to a dolphin? Would you feed that dolphin to an orca? Why not? What's the difference?
Also... using the term "rabid vermin" to describe prairie dogs pretty much shows you don't "see both sides" doesn't it?