Unfortunately human nature need to be fixed, we are killers.
It's not only animals, we are killing and torturing humans today as we done forever before.
We kill for money, love, profits, culture and religious difference, indirectly when we vote for crazy people or let government go to war...
The problem is deeper than vegetarism, we should find a way to respect what and who surround us.
Yes we can't be perfect. Is it a reason to do nothing? where do we arrive to be perfect?
Look like we do a lot of things in life where we don't care to achieve perfection.
Monkey see monkey do
Probably what SS were thinking when they obey to oder.
Think by yourself, don't do what you would not like to surfer, each person is proportionally responsible to humanity condition.