What do you mean by 'should' in this context? And how did you come to that conclusion?

(I know that these questions sound rhetorical, and it may be useful in a sense to take them that way, but they're not intended to be. Rather, I'm actually curious; my mind naturally works in a rather Buddhist kind of way, and never generates that kind of conclusion except in a purely instrumental sense, and I've always wondered how normal people do it.)