Because mind which is complexity(one of two) whereas heart is adverse(reverse)(zero to one). There is sense difference between mind and voice(heart).

ANTI-ESTABLISHMENT (anti-other/s) MIND even though being pro-establishment (pro-other/s) heart IS CRIME.

PRO-ESTABLISHMENT (pro-other/s) MIND even though being anti-establishment (anti-other/s) heart IS LAWFUL.