Nation Suspect in Waukesha parade attack has history of domestic violence. Experts aren’t surprised. November 26, 2021Ashley Luthern and Mary Spicuzza, Milwaukee Journal SentinelComments Off on Suspect in Waukesha parade attack has history of domestic violence. Experts aren’t surprised. Experts and advocates who help survivors of domestic abuse say it's a troubling pattern they've seen repeatedly in mass casualty events.