No, it was not a good reason, here's a good reason to get angry, a communist murders 69 million people in China, that's a great reason to be infuriated but to channel that anger into something productive and to over time forgive those people and help the victims of that terrible crime committed on the killing fields, greed, is not a just reason to be angry, it is unjust and petty. Anger without a just reason is a sin, all sins are compared the same by God because all are worthy of eternal punishment. God is eternally higher than us, the higher up you get, the higher the consequence, therefore the penalty for sin is eternal punishment. This is called logic.