Here's why:
* Calm: To make peaceful or tranquil.
* Soothe: To ease or relieve.
* Still: To make quiet or motionless.
* Allay: To lessen or reduce, especially fear or anxiety.
* Pacify: To make peaceful or calm, especially by easing anger or agitation.
All these words describe actions that bring about a state of peacefulness or tranquility.