why people say „Scheisse“ all the time?

one of our guest traveled through Switzerland,
when he often heard the word «Scheisse» which finally inspired him to wirte this poem

Scheisse is not such a terrible thing
doggys do it naturally and owners put it in the bin
Scheisse is done by thousands of us
there really is no reason to make a fuss
one cannot get upset how many times a day
a sense of relief, often I say
Scheisse comes in all shapes and forms
but please keep them off my beautiful lawns

the Student