it's all got a bit circular hasn't it?
Until you can provide proof of what you believe to be fact; 'That the slaughter of animals can be achieved without cruelty or torture' then we have no way of progressing. I would agree that some forms of slaughter appear to be more 'humane' than others - but this is a subjective view and in no way proof of anything at all.
'When I despair I remember that all through history the ways of truth and love have always won. There have been tyrants and murderers, and for a time they can seem invincible, but in the end they always fall. Think of it-always.'