Any bomb that is at least as big as a car (either as one explosive or a cluster), is truly made to make a huge blast.
The reason is that when you have Stuff Blowing Up, it's often good to have bigger explosions. But that doesn't necessarily mean the actual bomb has to be large, especially these days with high yield explosives. Before then, huge bombs were the easiest way to make it clear the [...] [tvtropes.org]