Why are people so obsessed on one direction?

[Moneth]

People at my school are so obsessed and all they talk about is one direction which is really annoying. They say stuff like 'If ever have a baby with -1D MEMBER-, Im naming our baby Morgan''. They also do weird things like racing on whos getting the math book that has the number '1'. They're very good singers and good looking too but why do they like them so much? :/ At home all they do is anything involves 1D (for example cry because of Fan-Fics, write fanfics, watch 1D videos on youtube, etc )