In practice.. yes, always.
Reason is the faculty which affords human beings the ability to restrain impulse or instinct, in deference to the rights of others.
It is what separates us from the animals.
And to think that it all came about by chance! The wheel of fate spun favorably that time, or did it? Maybe it would've been easier if we were like animals.
Funny thing though, animals without reason don't ever seem to thrill kill.