Leave your values, beliefs, religion and judgements at home. Many of the places you will work in will quite probably have very different ones. You may see grinding poverty, skinny kids who have nothing but the few clothes they stand up in with mothers who are little more than birth machines. A situation perpetuated by corrupt governments that the mutil-national companies that you are working for are quite probably helping to stay in power.
Take the money, lie by the pool on your day off, tell your wife and kids it is hot and sunny and you miss them but don't spend too much time thinking about what you are doing there.