I think I have found a diplomatic solution to this question/problem. I just answer the bad question to the best of my ability and include the whathaveyoutried.com link as a side note in hopes that they will better understand all the down votes on their question.
Its often better to lead with a carrot, than beat with a stick.
This was my first answer on Meta, posted back in April of 2013.
I think I should revisit it now that I've spent a little more time on the network...
I'm not sure if I've become a little less forgiving or if I just understand the SE culture a little better now, but I would like to recant my previous statement about a "diplomatic solution".
I still believe its often better to lead with a carrot than beat with a stick, but please for the love of all that's good and right about SE don't answer bad questions. My previous view held that bad users could be convinced to be better users with a little patience, which is probably the exception, not the rule.
Call me cynical, but I've come to the conclusion that my previous approach leads to more bad questions. When users get answers to bad question, they are given an incentive to ask still more bad questions. Worse than that, other users see that bad questions get answers and ask more bad questions of their own.
Don't get me wrong I'm still a fan of the whathaveyoutried.com article. It is invaluable advice for any one who is new to asking questions online. I wish there was some way we could squeeze it into the help center...