The discovery of oil comes with a huge blessings capable of transforming individual lives communities, states and even countries if well managed. But a situation where the proceeds are miss managed it will turn to be a cause as individual will rise against individual, states Wil rise against starts, countries will rise against countries.
Violence is a bi-product of greed and corruption! You can take an example of African continent. Despite holding the highest amount of natural resources, they are the poorest! yes, Europeans are also partly responsible for this because they wanted to continue with their colonies so they had created some Frankensteins to ignite the internal wars. But if Africa can really manage their resources well, they will emerge as the richest continent on the earth.
So natural resources are always a blessing. But when such wealth falls into the hand of incapable leaders, things turn into chaos. Then the countries like US, UK, France and China comes to promise a good life by investing billions of dollars and they starts capturing the resources when those leaders fail to pay back the debt.
If you look to middle east, oil has changed the lives of the people there except a few countries. If you look to Africa, natural resources has brought in issues for the citizens. All depends on how you handle it!