Romanticism was the practice of idealizing someone or something while ignoring their negative qualities.

In 2267, Spock found James T. Kirk and Montgomery Scott's admiration of Khan Noonien Singh, whom the Vulcan characterized as a "ruthless dictator", illogical. (TOS: "Space Seed")

According to Elim Garak, Damar had a romanticism for the past. When Kira Nerys confronted him in 2375 with the parallels between his people's actions against the Bajorans and the Dominion's actions against his wife and son, he was startled and took a step toward her. After Kira criticized herself for speaking so boldly to him, Garak assured her that he needed the jibe. (DS9: "Tacking Into the Wind")