[blablablerg]

They realized:

- More chance of getting away with it vs (attempted) assassination, since you usually don't cause bodily injury or death (so police divert less resources to the crime) and you are well away on your scooter when the explosion happens. Lately more have been getting caught however. Still the punishment then is less than with (attempted) murder.

- More kids willing to do it, because punishment is lower, and chance to get caught is lower.

- Besides the intimidating effect, it creates pressure on the victim by the neighbors and the government, because they now suspect the victim is a criminal and want it to stop. It can even lead to eviction.

All in all in pretty good way to pester your enemies without escalating to murder.