Open this photo in gallery: Yaron Lischinsky and Sarah Milgrim were shot and killed as they left an event at the Capital Jewish Museum in Washington on May 22.Embassy of Israel to the USA via/Reuters Growing up in Skokie, Ill. in the 1970s, Jeffrey Elikan doesn’t remember the need for any security at his local synagogue. Nor did he feel unsafe at university in the 1980s, when he studied at Columbia and Cambridge. But as he was walking to synagogue in Washington one day this past year, he said, someone in a passing car shouted “dirty Jew” and swore at...