I suppose it depends on whether you believe if I left my door unlocked and someone burgled my house, whose fault it was.
I'd say a bit of both. Yes, people shouldn't be leaving their wifi unsecured, but at the same time I see no reason for them collecting this data except for nefarious reasons.
If it wasn't an accident, why hadn't they deleted it three years later
, despite ICO demanding them to do so?http://www.gizmodo.co.uk/2013/06/ico-go ... s-or-else/