I was thinking more a half ounce of lead in the head... then throw them overboard.
But you're right, rope is cheaper.
Dealing with piracy in the old way evolved over thousands of years, was simple, final and the recidivism rate was zero.
If it ain't broke, don't fix it.
With profound apologies to the ACLU, the internationalist human "rights" groups and other mental deficients.
< /sarc >
Finally, someone on this thread I can agree with!! ;-)