They already hate before getting in.  They resent your prosperity, hatebyou for it and want to take it away and make you suffer in the process. 
Immigration before cheap instant global communication had an inbuilt compnent that favored assimilation. You left everything behind, lost coonection to your country of origin and had a huge incentive to become part of the new place. That has changed for ever, and we now have a lot of people that live physically in a new place but they do 90% of their social interaction online with their homeland.