I have no patience whatsoever for the people who cite Obama's drone strikes as if these somehow excused or mitigated Trump's ongoing campaign of drone murder in the Caribbean and Pacific. Tu quoque is not a valid form of argument; and no precedent, however obscene, can normalize or relativize the fact that our government right now is blowing up civilian vessels in two of the world's oceans—murdering all their occupants—without even the pretense of there being armed actors on the other side.
That said, it's probably a good exercise for me to occasionally look back and remind myself: Obama's drone strikes were also really bad—even if they were not exactly the same thing as what Trump is doing now. A poem by Heathcote Williams from that era, "Lord of the Drones: The President and the White House Fly," gave me that reminder that I needed, when I read it this week.