There's never "nothing we can do..."
> The point is to chip away at the perception among miscreants that online crime is risk-free...
Exactly... even if the job is difficult, giving up and letting the baddies carry on isn't an option. Difficulties with jurisdiction are, of course, a major issue, but it's worth at least dealing with the known threats from one's own jurisdiction.
Here in the UK, it's very unusual to find IOCA (images of child abuse) being commercially distributed from servers situated within any of the domestic jurisdictions [Scotland and N. Ireland have their own legal systems], although individuals invariably continue to download on to their own machines. Why? Because of the proactive efforts of CEOP, SOCA, and local police forces to identify users and distributors, and the heavy penalties on conviction.