There were Union depredations and there were bushwacker depredations on Southners in Sherman, Tex and in Ark has the authors Leslie and Feldman go into in great detail. Yes the Jayhawkers were real bad and sometimes non Kansas troops forced them accross the border and some Generals wanted Lane arrested but he had powerfull friends.
Has Frank James stated in 1913 "in order to be forgiven we have to forgive they did evil we did evil".

Leonard