I simultaneously do not think those soliders should have been there and morally i think they made A Bad Choice AND the i think the idea of punishing people based on their past actions is not actually going to be productive unless you’re actually preventing them from doing more bad things, which having PTSD will likely not do :C

This kind of makes it sound like someone's going to go out there and actively spook troops into having PTSD.

Nobody is inflicting a punishment onto the troops (even though, as you said, they should face trial). They're just suffering the natural consequences of their own shitty and immoral decision.