[Joe 6-pack]

"Specifically, why not treat them as pirates -- and hang them?"

Because hanging is obsolete. They should be shot. Unless of course they are of any intelligence and/or propoganda value in which case such value should be extracted utilizing all necessary means, after which they should be shot (or hung, if you hopeless romantics prefer.)

[BenLurkin]

Shooting them works for me.

Send their families a bill for the cost of the bullet.