There are many people in this world who will con, rob and steal from trusting people. It hurts people who want to trust in the good of others and causes them to be suspicious of everyone's motives. The big factory farms; they feed more people on less space. The animals live a life of suffering and torture because of it. Monsanto makes round up ready vegetables; our bees and butterflies die, and it is affecting us too. Factory dairy farms produce more milk, but the cows have to get antibiotics constantly and have their babies ripped away at birth causing cow and calf to suffer. Is it really worth it?
In stating that the means doesn't justify the ends is an inherent question of context. This is very hard to generalize, however generally speaking, the ends relative to the means are justified when the outcome matches the effort, or lack thereof. When one studies less for a test, and gets a C, the C is justified, as the student did not study as usual. Usually an end is justified, relative to a means.