You might expect, therefore, that the leaked private emails from Joe Ricketts, whose family owns controlling interest in the Cubs, would cause me concern. The emails released Monday by Splinter News reveal that the TD Ameritrade billionaire traded not just in high-value stocks but also in low and bigoted tropes — with a particular obsession with Islam. Statements such as “Islam is a cult ... based upon ‘kill the infidel’ ” and jokes built on the idea that in the future Muslim people do not exist appear to outnumber offensive emails regarding African-Americans and Mexicans.