migration toward non muslim country

why do some muslim migrate toward non-muslim country?
I,ll tell u :some polythiest country give u more rights than some muslim country do.
so,muslim people go there searching for freedom
one man ask a wise man that he want to leave a muslim country toward non-muslim, complaining his unability to get his simple rights where he lives ,the wise man ask him:can u practice and spread your religion their?he replied: yes. then he said>: ok go ahead. so ,if you are restracted the migration must be undertaken-migration its not just from nonmuslim country toward muslim one but also the opposite is right