Exactly. It would be at best militarily pointless or even counter-productive to the military effort by wasting munitions. And moreover it would play right into the hands of the Zionist-imperialist propaganda.

Look at all of the terror shelling and drone attacks against civilians that Ukraine constantly engages in. Has that helped them militarily in any way, or has it only hardened Russian resolve?

Why is it that Russia has been so insistent to not retaliate in kind against civilians - even though they could inflict much more damage than Ukraine can - and instead responded only with strikes on military targets and dual-use infrastructure?

Because that is how you win wars. You remain disciplined and stick to the plan, especially when it is clear that the plan is working and the enemy is desperately lashing out to try to provoke you into making mistakes.

And also, the importance of the "moral high ground" should not be underestimated. Not in a liberal idealist sense but in considering the real geopolitical implications it has when you can credibly portray yourself as engaging in legitimate and legal self-defense.

The West will try to portray you as the "bad guys" no matter what, but there is a big rest of the world outside of the West and they are not stupid, they can see who the hypocrites are. And finally it is also important for your own population and your soldiers to feel like they are on the side that is acting morally.