I like to say that violent revolution has nasty effects and fails, but we don’t see all of future’s history. Maybe those deaths weren’t in vain. I know it is a horrendous thing to say, but the truth is we don’t know if they were steps towards something better.
I would still prefer zero casualties if possible, but that is admittedly an ideal.
Maybe the revolution is still happening and is just not apparent or as apparent as something like say “Red October”.