[zoombini]

My kids spend hours on the computers & Xbox between them.

Yes it worries me how much time they are spending on them, however the alternative is what?

Go outside & play, go & have some external activities etc.

What activities? there are none that do not cost huge amounts of money each week. I.E. a few hours skateboarding at local skate park = £5.

Play outside?
As parent we are constantly worried about our kids when doing this, not because we think they are going to get abducted or run over, but because they are likely to get bullied or assaulted by other kids or yobs in the area.
And this does happen, and there is history of it. My eldest once plucked up the courage to nip to the local shop 500 yards away & got beaten up on his return & his glasses smashed for doing it.

As for abductions & being run over, well drivers zoom up & down constantly despite road humps, so yes it is a worry no matter what any stat's say.
The same goes for abductions etc.

I'd rather my kids played too much IT than became a statistic thankyou.