Indigenous savages: to help or not to help?

[hmkpoker]

You and your friend are traveling around the ocean in a boat when you come across an island that hasn't been charted on the map. Intrigued, you anchor at the shore.

You pull out a pair of binoculars and see some people on the island. Racially, they look similar to you. Their shoddy garb suggests that they live with stone-age technology. Curious, you and your friend make some clothes similar to theirs, and approach the people trying to blend in (you pack a gun just in case things get out of hand).

You both meet a few of the men of the island, and thanks to some keen linguistic abilities and quick wit, you both manage to blend in. You spend the next few days with the natives, and discover the following about their culture:

They have lived on this island for countless generations, and don't know any world outside of it. There are approximately 300 inhabitants on the island. It is a hunter-gatherer society, with no technology past fire, the wheel and alcohol-brewing. There is no well-defined theology. The males are very aggressive and often hostile toward one another, and toward women. Rape is not frowned upon, and takes place frequently. Consequently, the men are angry, insecure and belligerent, and the women are submissive and frequently depressed. There is a high infant mortality rate, and the average life expectancy is in the high twenties.

No one seems interested in the idea of a different (or better) life; in fact, you find that discussing it raises ire. Regardless, everything we know about psychology (and common sense) tells us that these people are not living very healthy, happy or fulfilling lives.

You have a ton of money and a lot of time on your hands. With your help, these people could be educated into living a better life.

Does this seem to be a reasonable cause?