Well I agree with you sentiment in general, I don't agree with it in this case, the kid didn't know how unsafe it was (she was only 3). Yes Parents should lock out the backseat controls and yes kids should be buckled in, but those don't really apply in this situation. From the sounds of the article, the truck was stopped and the girl was in the front seat (making the lock-out button ineffective); if they hadn't got underway yet then her Mom might not have had a chance to buckle the kid into the seat...
What's really tragic here is that the solution is so easy to accomplish,
design power window switches properly! My Matrix has recessed window switches that only go up if you pull up on them. Most of these accidents happen because the switch is a push and little feet or knees can press them into the up position! I actually thought switches like my Matrix has were now required to prevent these tragic accidents.