The whole point of the trolley problem is to illustrate how difficult culpability/blame is and how a single choice can be incredibly multi-faceted to the point where you can’t possibly untangle it and find the “correct” answer unless you adhere to a strict, well-defined moral framework. Which usually means making a choice to ignore other factors and other valid moral frameworks. Hence the conundrum. It’s real use is to test drive how each framework handles the situation and to see your reaction to it.
You're missing the lesson here, or purposely obscuring it to win an internet argument in the hopes no one looks too closely because you cited a thoroughly-meme’d smart sounding philosophical question.