Tomer Saliah and Lior Shemesh drove their mountain bikes south from Tel Aviv Tuesday morning, ready for a ride they have been avoiding for two years. The gravel trails around Kibbutz Be’eri slip through the hills and forests of the northwestern Negev. Their tranquil beauty has made them one of the country’s most popular cycling destinations. Their proximity to Gaza has also made them its most deadly. On Oct. 7, 2023, a dozen cyclists were among those killed or taken captive by Hamas-led militants on Simchat Torah, a holiday that is normally a celebratory occasion. But “after what happened in...