Sorry James but in my opinion your very wrong. Firstly i have several friends who work as proffesionals in pest control and whilst i dont know what pistol they use..a pistol is what they employ. As said no-one without exception should be killing anything unless they can do it without causing suffering.
as to your coment about squirrels or similar not experiencing pain in the same way, im afraid your about 30 years out of date.
The UFAW did a huge amount of study into this issue and of course we have the Bateson report as well... there is absolutley no doubt that higher mammals experience pain the same as we do, what is diffrent is the manner in which they express that pain.
In the wild state animals tend to hide
pain for very obvious reasons.. they still exibit the exact same neurological response. As to the FEAR
factor... i suspect i have more experience than anyone on here with handling wildlife that is injured and in pain.... and i can assure you wildlife squirrels included do feel pain and do suffer extremes of stress....
Again i say if you can kill cleanly then i have no problem, but to cause suffering is ignorant and has nothing to do with anthropomorphism. we are only animals so are squirrels lets not get too excited and think we are set up in some higher manner that precludes other animals to suffer.... your analogy of an earthworm is irrelevant...they have a completley diffrent neurological set up.....