Why was Wilson against having secret treaties

Wilson believed that fundamental flaws in international relations created an unhealthy climate that led inexorably to the World War. His 14 points outlined his vision for a safer world. Wilson called for an end to secret diplomacy, a reduction of armaments, and freedom of the seas. He claimed that reductions to trade barriers, fair adjustment of colonies, and respect for national self-determination would reduce economic and nationalist sentiments that lead to war.

If he breaks the law then he had to resign from his post and so he'll lose his/her powers.

Not sure this is a hard one huh