I doubt its really air pressure related
front tires wear faster than rears due to steering and more wear on things due to angles the treads see
add in when in the tires will grab more when turning and add friction to things, again causing more wear
its why if you have a locker the ATV ONLY wants to go straight when locked
tires from side to side, have different tire speeds when turning, add in 4x4 and even more resistance
and you get faster wear!
air pressure MIGHT add to some things some what, as low air or added traction can cause more grip, thus more wear
but I wouldn;t call it pure air pressure, that causes excessive wear or not, unless your running them SUPER low and well, the wear will speed up as side wall weakens! and again getting you a larger footprint thus more traction, and more wear!
also, if your running TOO Much air pressure you can for sure wear centers out faster, you'll also get rougher rider quality, and less then great handling too!
atv's are designed to run on LOW air pressure tires, so filling em up to above recommended pressures you can cause handling issues!