Q: why can't you go back home in 'outside' and 'La de da de da de da de day' :(
A: after reviewing those songs, to refresh my memory, in 'outside' the reason you 'can't go back to where [you] come from' is 'because [you're] not welcome, and it's not fun there', and in 'la de da' the reason you 'can't go home' is because you 'got no home'