I find some moral arguments against interventionism lacking.
Sometimes these governments are illegitimate, both by ours and by theirs standard, kept in place only by oppression. Then I fail to see how it is wrong to interfere, it is not like they chose it anyway.
Second, if there were human rights abuses in my country (irregardless whether by legitimate government or not), I would support foreign occupation assuming it would help to solve the issue. So even based on golden law logic, interventionism could be justified for me.
Third, there is no objective reason why intervention among property borders, town borders, district, state or plenty of other borders is considered justified, but among national borders it magically is not. All of these are similarly just lines in the ground.
I myself tend to not support foreign interventions, but I surely dont act as if I have some higher moral ground. My stance is based on economic and PR reasons.
"Billions for equal chances, not a penny for equal results."