If political violence is unacceptable within the United States, then it is also unacceptable abroad (war, drone strikes etc)
Only actual direct self defense, not preemptive strikes, summary/extrajudicial executions/assassinations/abductions, or anything like that, are allowable. Or else you can just accept the contrapositive of this statement but it's against the rules to advocate for that. No middle ground has any logical, non arbitrary special pleading justification.