Sorry, but the EP is totally right
Adults should not "befriend" children.
Adults have the responsibility of protecting children and educating them, not being friends with them.
It is a sickness of today's society that adults consider having to be friends with children. Becoming a friend is often viewed as facilitating communication. Unfortunately the opposite is true : if the adult becomes a friend, he loses authority and his views become dismissable.
Adults online have absolutely zero reason to try and get the phone or address of a child. I'm going to be totally, shockingly politically incorrect here and say that, outside of family ties, adults should have zero interest in other kids. Beyond polite enquiry to a parent about his health and scholarship status, a normal adult should not devote any more interest in a child that is not part of his family or his best friends' family.
And I'll even go one step further and say that, outside of security or behavioral issues, an adult should not even speak to a child he does not know and that has not been presented to him by someone who he does know that has some family tie with the child.
Of course, online it is sometimes a bit more difficult to find out who you're talking with, but a child will undoubtedly give himself away at some point by using some school expression or other construct that an adult would not use. At that point, an adult should be aware of the situation and behave accordingly in any future correspondence.
Children need to be friends with children, not with adults. Children need to make their own mistakes and understand their own lessons, which is something they cannot do with an adult because, by default, an adult "knows". There is no room for a child to experiment life with someone who already knows about it.
Without going back to the old days when children were considered well behaved if they never opened their mouth and sat still, we need to learn to guide children without either lording over them nor doting on them. Which also implies that we all need to become proper, responsible adults. Maybe that last bit is also part of the problem.