What`s your opinion about fairly oddparents cartoon?

i think its episodes have not any connection with together...for example in an episode has been said that the reason of vicky`s evilness is an bad bug and in another episode the born of tootie...or in an episode timmy and vicky are friends and in next episode they are enemies again with no good reason...so with these dichotomies we can`t understand what cartoon want to say...why don`t timmy and vicky be friends for ever?