What acts as a far more effective circumstance for generating compassion and what, in fact, rouses us from our comfortable meditation seat is actually seeing or hearing others - encountering others directly, not just conceptually in our imagination.
The compassion we feel normally is biased and mixed with attachment. Genuine compassion flows towards all living beings, particularly your enemies. If I try to develop compassion towards my enemy, it may not benefit him directly, he may not even be aware of it. But it will immediately benefit me by calming my mind. On the other hand, if I dwell on how awful everything is, I immediately lose my peace of mind.
How can one be compassionate if you belong to any religion, follow any guru, believe in something, believe in your scriptures, and so on, attached to a conclusion? When you accept your guru, you have come to a conclusion, or when you strongly believe in god or in a saviour, this or that, can there be compassion? You may do social work, help the poor out of pity, out of sympathy, out of charity, but is all that love and compassion?
The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit.
Because the existing education system is oriented towards materialistic goals we need to pay special attention to inner values such as tolerance, forgiveness, love and compassion.
I think there is a complicated side effect to overcoming evil in that we are forever changed by it. I think after we ingest some of the cruelty of the world, it takes years off of our lives, but it also gives us wisdom and a little grace, hopefully a sense of compassion.
The wounded surgeon plies the steel
That questions the distempered part;
Beneath the bleeding hands we feel
The sharp compassion of the healer's art
Resolving the enigma of the fever chart.