From the very beginning, the Terminator movie franchise has been a dark, brutal sci-ti tale about the terrors of runaway artificial intelligence, nuclear apocalypse, and killer robots hunting humans day and night. The Terminator movies usually end on a positive note, with humanity triumphing over the technology of tomorrow, but every victory is a painful one. Most of the pivotal scenes in the Terminator movies tend to be rather dark.
Source:https://www.cbr.com/terminator-movies-darkest-moments/