Tell me what you want, what you really really want..... 
Every consumer of IP to understand the rights and limits of what they have purchased? That would do for starters......
I think we are pretty much set on different sides of this issue. Maybe me being a hobbyist and you being someone making a living as a photographer has something to do with it.
Yes, I think we are. As Drew et al have said, theft is theft no matter the intention. A slight reword of "copyright" is "the
right to
copy" and if you did not create, or buy the right to do so then it is wrong, hobbyist or not.
Why? It is worthwhile remembering that hobbyist or pro alike enjoy the same protection with respect to their creations.......every time the hobbyist presses the shutter the rights and protection to what the camera captured are the same as whatever a pro shot. Copyright makes no distinction with respect to the artistic ability, talent or commercial potential.
Granted the same rights, it is reasonable to give the same respect to others.
When finding an infringement I take a measured approach; is the use commercial or not? I then contact the infringer, and their response/attitude determines to a certain extent the next actions.
If they are a non-commercial site and are rude, I would launch a claim.
If they are polite, I ask for its removal and treat the exercise as a education process.
Commercial users alway pay. If they deny use, try to hide or conceal the use, try the "we have taken it down and consider the matter closed" approach, or be otherwise less than trustworthy then the level of damages is non-negotiable with 7 days to agree to pay or I hand it over to the lawyers.
I guess what I am trying to say is; Don't depend on the goodwill of the rights holder if you are caught.
.....
It is particularly timely and ironic that I have just flicked through the 3rd quarter of The Undersea Journal, and on page 57 I find one of my photos. OK, so the photo is with a variety of stock agencies and I probably received royalties for it's use and I get credits on the page but the picture is used to advertise a competitor's dive shop.....
These days I would assume nothing and check out if the user has indeed purchased a license.