It’s the trolley problem with a single track: you can pull the lever and the trolley will run over 5 people before it stops, or you can not pull the lever and the trolley will run over 10 people.
If you’re standing beside the lever with your arms crossed refusing to pull it, saying “the fault is on the person who tied the people to the track. Getting involved makes me complacent.” Then yes, people are going to blame you because even if you didn’t cause the problem there is something very easy you can do to make it less bad.
You can’t save all 10, but you can save 5. So you do what you can, and then you also go after the guy who tied the people to the tracks.