I've argued the same thing in the past. Seems to me, you get a lot more chances to throw LF to home/2nd than you do RF to home/3rd/2nd. Cause and effect though. Is that because there are more opportunities, or are there more opportunities because the weaker arm is traditionally in LF and the stronger in RF? To the same effect, plays where a guy easily scores/advances on the weak armed guy are going to have a play on them with the strong armed guy. My thought on it is based on my assumption that LF is getting more action than RF, and therefore would have more chances at making the throws.