We are not unaware; information on the suffering of other animals is not in our unconscious minds; rather it is in our subconscious minds. In order to continue using other animals without causing ourselves psychological stress and anxiety, we have to suppress that knowledge.
Continually suppressing that knowledge does not make for good psychological health. It is a waste of our mental energy and it prevents us living the truth. Many new vegans describe a type of lightness or a sense of peace as there is no need to hide from the consequences of their lifestyle.
As long as we sanction harm against defenseless, sentient others, we will live in a violent society that is predicated on inequality. Evidence suggests that the rate of violent crime (as measured in arrest rates for violent crime, rape and sex offences) is higher in slaughterhouse employees than in other industries and that this is directly attributable to the violent nature of slaughterhouse work (Fitzgerald et al, 2009).