Beware of dogmatism. Rigid thoughts are the way into stagnation. Stagnation equals death. If someone or something threatens your survival, then have no compassion towards it. Attack the enemy before the enemy attacks you .
Survival is to be tougher and more aggressive than the enemy.
Self-sacrifice is never good. Expenditure of energy on your part is always done to further your own ends. People who don't help themselves are not worth to be helped by others. Never believe moral ideas being pressed onto you. An idea or thing is good if and only if it is useful to you in a specific circumstance.