What happened to the phrase, "We all live downstream?"
Nothing. It's conservation only in the extent that it does effect other areas. That's why I put the stipulation in there that a club can dump growth hormones in the water if they wanted, and it doesn't make a difference, so long as it doesn't escape their property.
To the extent that you are improving areas outside of the property, yes, it is conservation. And likewise if you damage areas outside the property, yes, conservationists have every reason to consider you the enemy. But whatever stays on your property is no business of anyone else.
In FD's case of making wetlands. Again, to the extent it improves the fortunes of birds and other critters which also grace areas open to the public, I would label it as conservation. If he, however, fenced in those critters and didn't let them leave, then no, the public shouldn't care about the welfare of them. They don't hold value by existing. They hold value by man's enjoyment of them, however he chooses to do that.
Having wildlife, trees, open spaces, etc. is beneficial to our health and mental welfare, in addition to providing recreation, and in some cases, providing food and other renewable resources.
This argument always comes up in land-use decisions. For instance, drilling. If it's damaging to public resources then the public has a right to concern themselves with it. If the benefits outweigh the cost, then you choose to do it in a manner and place where that trade off is most positive. And included in that decision is how many people it's effecting. For instance, in my mind, while drilling in ANWAR may not be a "good" thing from a conservation standpoint, it is certainly "less bad" than drilling in areas where a much higher number of people are affected in a more damaging way. If forced to make that choice, I'd choose drilling in ANWAR over, say, a national forest in the lower 48.
Or logging. There are anti-logging groups out there who think that "hands off" is always the best approach, logging is evil and if we could simply stop doing it that would be best. And yes, logging can be damaging. But it can also be very beneficial if done right. Mixed age forests tend to support considerably better biomass of wildlife, and they also tend to support a higher degree of human tourism as a result. And that's not to mention the obvious, supplying wood and paper to people in a renewable manner, which may be FAR better than the alternative materials that would be used for those applications. So, IMO, it's something we need to watch and make sure it's being done in an intelligent manner. But yes, it CAN be better from a conservation standpoint to encourage logging!
Humans effects on the environment are not innately evil. We have the power to change it, for better or worse, and need to be intelligent about our decisions. Conservation is about making good decisions, and preventing bad ones.