I think the message molecule is trying to convey is that hitting a pillow is an unhealthy way of releasing anger because doing so conditions you to...hit things

I think the message molecule is trying to convey is that hitting a pillow is an unhealthy way of releasing anger because doing so conditions you to...hit things out of anger. Maybe next time your pillow isn't around but your wife is and you're more angry than usual to the point that you can't cordon it off until you find a suitable pillow. On the other hand of your response, exercise would be a healthy response but may not be possible in all situations. If you're angry at work for some reason, you can't exactly go for a jog in a business suit. The best response would be whatever calms you down and lowers your blood pressure and is something you could do in all situations. Furthermore, it would help to be cognizant of what makes you angry so you can avoid those situations and/or just force yourself into them often so you become acclimated. YMMV