I put it down to them being so excited to find a place like this they "dont think before the brain does" and post with out looking around the place first.
Hell, when i came here i done the same thing, was so excited to find something i was searching for i posted without looking around first and got shot down in flames by others.
Also try to remember that most of us that have been here for a few years do get pissed off with seeing the same thing/questions posted over and over again when the answer is in the FAQ.....so there will be times when newbies will get a shity reply just like your own kids that keep asking for the same thing over and over!!!