• compulsory means required by rule or law or obligation

• compulsive resulting from, relating to, acting on an irresistible urge, especially one that is against one's conscious wishes.

• a compulsion is similar to the above but is also the action or state of forcing or being forced to do something; constraint.

• to compel is to force or drive or use pressure

• compelling is evoking interest, attention, or admiration in a powerfully irresistible way — and therefore not usually able to be refuse

So most of these words imply something forced from the outside perhaps resulting in behavior that may harm us or others and that we may regret. And then compelling turns that on its ear — and what is irresistible is not necessarily bad, and most probably beautiful or fascinating and powerful.