in his right mind
Adjective Satellite
Meaning
behaving responsibly
Source: WordNetSynonyms
Examples
I cannot conceive how anybody in his right mind should go to a psychoanalyst.
While no man in his right mind would advocate sending our ground forces into continental China, and such was never given a thought, the new situation did urgently demand a drastic revision of strategic planning if our political aim was to defeat this new enemy as we had defeated the old.
Any guy in his right mind would die to play Batman.
Some people worry that artificial intelligence will make us feel inferior, but then, anybody in his right mind should have an inferiority complex every time he looks at a flower.
To assert in any case that a man must be absolutely cut off from society because he is absolutely evil amounts to saying that society is absolutely good, and no-one in his right mind will believe this today.
That fabulous polymath Samuel Johnson maintained that no man in his right mind ever read a book through from beginning to end.