you forget about the other benefits of free trade. the removal of protectionist tariffs lowers the cost of living to the poorest. when food takes up say 80% of someones income is a tariff of 25% on grain imports helping?

better working conditions is because takeing indonesia as a case study 8 of 10 foreign firms were described as 'exceeding significantly' the working condition standards set by their government. wheareas 7 of 10 native firms did not meat the minimum standard.

i would also say that the introduction of foreign firms is only the start, 10 or 15 years of stability in which foerigners are not hounded can lead countries to the state that the tiger economies are in today. south korea used to have a gdp lower that botswana, now i believe it has 32 times it.