Jews have been persecuted first because of their Religion back in the Middle age and then further because they're not the lower race or culture but the higher one. While in Europe before ww2 most were rich, educated and were occupying the major positions in social life. Hitler understood what to do to gain immidiate power . if he lived today same he did with the jews he'd do it with muslims and today few people would pprotest.
More than 100,000 asylum seekers entered Germany in August, official says (Reuters)
from the article: Jews reluctantly abandon Swedish city amid growing anti-Semitism