They certainly could be prosecuted; see https://www.cair.com/press_releases/cair-chicago-urges-doj-to-file-war-crime-charges-against-naperville-man-who-joined-i

They certainly could be prosecuted; see https://www.cair.com/press_releases/cair-chicago-urges-doj-to-file-war-crime-charges-against-naperville-man-who-joined-idf-admitted-sniping-children https://www.cair.com/press_releases/cair-chicago-urges-doj-t.... But at this point the DoJ acts more like Trump's personal law firm.