The real scary thing is that we have killed over 2000 Islamic terrorists with these drones and still there are more Islamic terrorists out there.
If the Brits killed 2000 members of the PIRA in 8 years it would have effectively wiped out the organization. Other well known non-Islamic terrorist groups (RAF, AD etc) would have been wiped out dozens of times over.
Just how many Islamic Terrorists are out there? That they can take 2000 casualties and be unaffected should be a sign we are fighting a much bigger war than we think.