To do 'the right thing' for the wrong reason

should be better than doing 'the wrong thing'
for the right reason -
except that there are always unexpected consequences
even hundreds of years later -
and the wrong thing might have been right after all,
the 'right' reason ultimately utterly mistaken,
given those inevitable unexpected consequences;

and how are we to judge intentions (and intentionality,
given the inevitable unexpected consequences)
when judgement is so vulnerable to emotional treason ?