Choosing the path that makes more death more likely while claiming to want no death…yeah, that’s moral grandstanding.
I get that it’s a real-life “trolley problem” situation, but it really isn’t that complicated. It sucks that the lever only goes two ways because of FPTP, but you’re not a more moral person for refusing to touch it.
If you actually care about people being killed, then join the movement against the FPTP system so that in the future “no genocide” will be an option, and in the meantime exercise your ability to save lives.