Is it prohibited to pay taxes in a country that uses those funds to support genocide? If that is the case, does this necessitate emigration or other methods to avoid materially contributing to the genocide?
Muslim should be always a good citizen who obeys the law if the land and serves his country in every possible way.
If you have an authentic evidence that your country is using your tax contribution in supporting a genocide, you need to raise you voice in every possible legal way against supporting genocide.
Emigration is not necessary unless you are sure that your tax contribution is definitely used in genocide and you have no way to oppose that.
Wassalam.