He did it to end seggregation among the African American players and White players. Also, because he believed that, Jackie robinson would be able to handle any racial slurs that would be thrown to him.
Explanation:
Firatly, the incident of an African American player that was not allowed to stay with his fellow white players in same hotel was an experience that prompted him to raise up to the aim of ending segregation. The argument he had with the hotel staff finally lead to the said player being allowed to stay with the team.
Secondaly, due to the untapped potential of skin coloured people was enormous and he was not confortable skipping them on account of that particular reason. The player who could be able to broke the color barrier would be subjected to jeers, abuse, threats, even assaults. He is so convinced that Jackie Robison would remained dignified in the face of all these, hence the reason he choose him.
