Board Thread:The Flash discussions/@comment-9346948-20160525000159/@comment-27399439-20160718154439

Kaestal wrote: I guess you're a bit too optimistic, ya can't save everyone.

And the scenario was the fact that Laurel was ALIVE resulted in those deaths and her dying was implied to be the only solution. In episode 19 of Supergirl, 3 people from work who are mind controlled, jump of a building. Supergirl manages to save two of them (James and Winn), the third a lady from work dies. In  the season finale  (episode 20) of Supergirl, James says to Kara "Hey Kara noboby could have saved all three of us, not even Clark".