P D G H M P D G
P H M W M L Y W O
O F F 6 I M U S S G
P - Forgive me
i know this is probably nothing, and will just lead to paranoia... but if you give each letter a number according to their place in the alphabet...
p = 16
whitman killed 16 people
16 - forgive me
and if you look at
P = 16
O = 15
= 31
whitman injured 31 people
P
O 31
P 16 -forgive me
creepy...