If you're a dungeon master like me who still keeps with fixed racial stat bonuses, what do you think the kender should get? Dexterity is the primary obviously, but I can see Arguments for Constitution or charisma and even possibly intelligence for the secondary
To me it just goes with their affable nature. IMO they are no more smart or healthy than any other race, but despite their many faults, people just tend to accept, if not like, them. Hence charisma.