The ICC hasn't been given any power by the United States (nor by Russia or China). If US _military_ personnel were brought there, it's obviously going to have a diplomatic/military response. It would be be an act of aggression.
Hard to care about cops being aggressive when "protesters" burn down buildings. If US cops actually got proper riot training like French police then citizens wouldn't need to take self-defense into their own hands(e.g. Kyle Rittenhouse).