Yes, as we all know, these polio programs are being targeted because the CIA used a doctor in a fake vaccination campaign as a source of intel back in 2010, definitely not because insane antivaxxers exist in every society and societies in turmoil find it easier to acquire both lunatics and explosives. That's why there were no antivax conspiracies in the Muslim world about vaccines being Western sterilization programs before 2010.
Melting them in a kettle would probably have a bad result, but yes, old UXO from the War in Afghanistan and cross-border attacks by Coalition forces helps too.