"the parent that set their kid up to ask this"
You don't actually know that to be true.  For a second, lets pretend it is.  A parent, aware of an activity in which her child was to take place, discussed at length the subject of the event.  She went on to help educate her child, with a nod to THAT family's values. 
Do you object to the parent being conscientiously involved in her child's education and character development, or is it just that you don't agree with the values of THAT family?
People can't make up their minds about whether parents should/shouldn't teach their kids.  Would the outcry over a scout asking a politically charged question have been the same, if it had reflected a pro-gun stance, or anti-regulation POV?  Would the scout have been kicked out of his troop?