Template:No Ontological Inertia
"To think that an end to the hostilities would be called the very day after the source of the troubles was defeated... it's almost ridiculously efficient."—Takamichi, Mahou Sensei Negima
Ontological Inertia is the tendency stuff has to continue being stuff. Things, in general, keep existing even when we're not looking at them. (Except, of course, for TV shows, which have the nasty habit of going off the air if people stop watching them...)
Writers often forget about this for some reason, and assume that the creator of a thing maintains some sort of existential tie to the thing created, and his continued survival is necessary. That is, if the creator is destroyed, it is "only natural" that the creation will pop out of existence, or preferably, explode.