I think part of the problem with this approach is its reverse psychology. These internet lecutres are quite common, and last I checked someone being lectured about their bad behavior or shortcomings tends not to respond in a constructive or positive way. Think about what happens when someone tells you not to do something. Often, your instinctive, subconscious response is to want it even more, or defy the alternate approach that's being offered to you.
It's hard, because there doesn't seem to be a clear or obvious nurturing solution. But browbeating people isn't going to motivate them to change their behavior. Quite to the contrary, it may stubbornly reinforce their resistance.