They didn't take them because they had no intention of using them. Its pretty simple really. Do you honestly think they forgot them?
Again you are speculating on what police intentions were , not having warrants on their persons is not ' beyond reasonable doubt'
that they planned to murder the 2 x Kelly, simply because an intention to murder 2 Kellys didn't require them to leave the warrants in town.
They very well could have carried warrants and murdered the Kellys anyway, had that been their true intention.
It would make good sense to carry the warrants even if the intention was murder...that way they could attempt to claim their actions
as justified in the course of executing their officially charged duty - to apprehend two fugitives under warrant.
