It's like when they say shark attacks happen near shore. Cause that's where the people usually are.
Car accidents are most likely to happen within 5 miles of your home, cause that's where you do the most driving, etc.
One of my pet peeves came up the other day was when they were talking about a LH hitter and they said he does most of his damage vs righthanded pitching, because he had 10 HRs vs RH and 3 HRs vs LH. That doesn't prove anything. What is it ,65-70% of the pitching in the majors is righthanded? And a lefty hitter is more likely to get days off vs tough lefties, so he might have faced righties for 75-80% of his plate appearances. So hitting 77% of your HRs off righties means absolutely nothing