Every time we eat meat we caused absolutely unnecessary suffering for a quick moment of pleasure.
you might mean "all of humanity" or "all meat eaters" caused suffering, but, in fact only the individuals who cause suffering have done so, and eating meat does not, in and of itself, cause any suffering at all. if there is any suffering involved, it happens before the meat-eating, and thus cannot be caused by the meat-eating, since an event in the future cannot cause an event in the past.