I don't doubt this happens, but is it really a "huge social concern" and does it "often gotten a Dad in more hassle than its worth"? Your anecdotal evidence says yes, mine says no.

Extreme logic alert...you say "as a father, I can't think of anything worse than some social entity claiming that my affection for my children has a nefarious intent." You can think of _nothing_ worse? Really? Where do you live I want to move there.

* emphasis mine