"The best we can hope for realistically is that the person grabbing will think twice if it is difficult and relize that it probably is not ok." I think that principle is sound, though I'd replace the vanished page with a nice explanation of why it disappeared. If we're depending on people to respond to what Lincoln referred to as, "The better angels of our nature," then a little education is always good. A 'keep off the grass,' sign will deter the good citizen, while a razor wire fence won't keep out the other kind.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken