The reality of golus is that עשו שונא ליעקב, we must therefore stay attentive to our surroundings.
On Shabbos Parshas Shmini 5750, the Rebbe gave over a captivating sicha that entirely changed our perspective on the concept of עשו שונא ליעקב in a startlingly new way: The following is summarized, free translation from the sicha above:
We have a known rule: הלכה היא בידוע שעשו שונא ליעקב. This is not only something that existed once upon a time but is also an intrinsic gene, inherited from father to son, from generation to generation, to this present day. This antisemitic hatred is only magnified when (in addition to the above) the father brings up his child in this fashion and becomes a negative role model for the son to exemplify.
This leads us to the very troubling conclusion that notwithstanding the favorable position the Jews find themselves in —living in a ‘מלכות של חסד וכו — we must know that a non-Jew still has a חזקת סכנה, and we can never know what the morrow will bring R”L…