Rightly or wrongly I see a lot of criticism regarding this issue but very few answers. It's very easy to rip the govt apart for implementing background checks etc.
The same posters would be the first in line of an agry mob if there were in fact no checks in place and a child was harmed - shouting "Why didn't you do a background check on this felon?"
We have to do something to protect children. So the majority of crimes against children occur at home and there is a lot to be done to help kids out in that position and prevent it from happening in the first place. But why do nothing for children that are under public responsibility (such as in schools, community groups etc)?
As for the people worried about allegations, inuendo and rumour I would suggest that every background check I've come across in the UK and EU (and I've managed more than a few in my role) only deals with actual convictions. However, if a call is received from someone saying "So and so is hurting children" of course it would be investigated - what person that cares about kids wouldn't?
Background checks on people that work ad-hoc in the presence of children but whilst always supervised by another vetted adult is a little overboard. However, background checks on an adult that supervises children by themselves - even if only for 1 hour a month - is not overboard.
Finally, as for the poster that stated the wrong message is being sent to children, aka trust no one by these background checks - are you so sure about that. Maybe we should instead of paranoia and 1984 worries be sending them the message that we're doing our best to help ensure that they aren't put in needless danger.
Summary: This may be overboard, but not performing background checks on adult in supervision of children is an unacceptable risk.