You Brits did a fair job of it once already. In the 19th century, Islamic jihads killed and enslaved millions across Africa, from Senegal to the Red Sea. Then Europeans colonized and put a stop to it. Famine and violence diminished. Death rates fell. Life expectancy increased by 15 years. Population doubled. (The same happened in India under British rule).
Then the Europeans left, and the jihadists are returning. Millions are threatened once again.

