This is absolutely ridiculous, honestly. Because a child COULD type in something pornographic and find porn, it's bad? I'm sorry, but that is your CHILD at fault, not the website. I know parents these days will blame everything before their perfect little angel of a child is at fault, but honestly. If you don't search for porn, you won't find porn. Your child being a pervert and searching for porn is NOT Bing's fault, it is your child's fault, as he or she is the one searching for it.
And, by the way? "type “adlt=strict” after all search terms" is not only for IT people. Seriously, you consider having to type in 10 letters and an equal sign as "will make sense only to IT people"? Wow. Just... wow.