Explain Holden's Confusion about his own assertiveness in chapter 13 in catcher in the rye?

Holden walks back to his hotel, although it is forty-one blocks away. He considers how he would confront a person who had stolen his gloves. Although he would not do so aggressively, he wishes that he could threaten the person who stole them. Holden finally concludes that he would yell at the thief but not have the courage to hit him.