I'm sorry, but I don't quite understand your point? Does it being a small % of the GDP matter to those stolen from? Does it mean we shouldn't attempt to remedy it?
We should care about it 0.002% as much as we care about other economic problems.
Not quite- from a strictly financial perspective, it means we should care 0.002% as much as we care about an intervention that doubles the GDP or eliminates 100% it. Neither exists, so we're better off comparing to other theft- this is about 15% of numbers for retail shrink, 50% of reported personal theft, so this suggests we should care proportionally.
But I don't know about the strict financial analysis. I'm pretty sure it would tell us to have negative care about a serial killer that targets the homeless.