the paradox of insanity

this is probably the most profound entry in my whole life..i havnt really scrutinised it for loopholes yet as it was just a passing thought..comments are opened to the floor..
insane: Very foolish; absurd
but who defines what is insanity? i THINK sanity is defined by a majority of sane people declaring the behaviour of a minority absurd..now what happens when the majority is reduced to a minority and vice-versa..say in this world there are 10 crazy people and only 1 sane person..then the 10 crazy people will find the behaviour of the 1 sane person absurd and declare him insane (at the same time declare themselves sane)..thus a reversal of roles and actions which were deemed insane like slicing your foot off are now perfectly sane actions
i think this can be applied to other topics..like the paradox of morality etc..
ok dont mind me im just shooting my mouth off without thinking..