Who is to stop it? The only possible answer is the USA. As you can see, any war/campaign we fight on foreign soil is not popular (ie. middle east). We won’t win any popularity contests by attempting to stabilize (democrafy) the middle east, but atleast we can maintain our in roads to obtain resources the USA needs to survive. Going into Africa would be altruistic (not gain us anything) and it would be seen as America meddling again. Short answer: There is not upside.