Most warheads are actually very safe, and require either a detonator, or very high heat/pressure to set them off. The most dangerous part of most weapons is act

Most warheads are actually very safe, and require either a detonator, or very high heat/pressure to set them off. The most dangerous part of most weapons is actually the propellant (which free-fall bombs obviously do not contain). This is a product of what weapons are designed for; the warhead is designed to resist premature detonation, but the fuel (and oxidizer if present) must be readily and easily combustible in an engine.