A city councilman in Virginia was seriously injured Wednesday when a man stormed into his office at a local magazine, doused him in gasoline and set him on fire — an attack that authorities say was rooted in a personal dispute, not politics. … Investigators stressed that the motive appeared personal and unrelated to Vogler’s work as a public official. Still, the assault added to growing unease over violence and harassment aimed at elected officials across the country, particularly as the boundaries blur between their public roles and private lives.