You just want to absolve yourself of that moral responsibility.
That's exactly what you are doing. You're focusing on this one issue, retreating yourself from the binary decision because neither options stands for what you (or I, or morality) would prefer. Completely ignoring that withdrawing from the choice plays into the hand of the infinitely worse candidate. So by not choosing, you do nothing to stop the situation in Gaza, but might actually make things a lot worse for people all over.
You can virtue signal that you did not compromise on your believes, while actually helping your country make a worse place.
The amount of heavy elements present in a star when it formed will be neglible to the amount that will be created over time through fusion.
You can actually detect this through spectroscopy because the initial amount of metals will be present in the outer layer of the star. Heavy elements made through fusion will be mostly in the core.
The reason stars formed from primordial gas, i.e. only consisting of hydrogen and helium, is that such a gas will fragment less as it cools and collapses. Less fragmentation means heavier stars.
I only have a high level knowledge of the process though.