I don't think being against widespread polygamy and western liberalism and its derivatives are mutually exclusive. They both have negative affects on Muslim countries.Marriage is not expensive for the vast majority in Somalia and most marry relatively easily and young. Polygamy is also normal and halal.
You should instead worry about the "non-sexist" feminist western countries that have popularized prostitution and only fans, family has collapsed, and there is an epidemic of single childless and depressed women.
You are a few decades late with this nonsense, everyone can see the misery it has caused.
Only following Islam and its rules guarantees everyones well being.