Perhaps the fact that he shot a man in the back colored his opinion? It sure does mine.
A reasonable point. But a sniper does not confront his target face to face. Are all snipers cowards?
BTW, I wish he had confronted Lincoln or his gun had misfired, as 30 years before Jackson’s attempted assassin’s did. Twice! Booth was 5’8” and slender. Lincoln, as old as he was, reportedly was still very strong. I suspect he would have kicked Booth’s ass.
Would you have considered the guy who tried to murder Hitler with a bomb hidden in the pillar of the beer cellar a coward?
I obviously don’t agree, but Booth considered Lincoln as evil as we consider Hitler to be.