The comment about being surprised was sarcasm, in case that wasn’t clear.
If someone conflates showing empathy for innocent civilians with empathy for the ‘other side’
and views this as dangerous,
then this could help explain why people might be discouraged from watching actual footage of what is happening in Gaza, or protesting,
because if the reality of the suffering was widely shared and as a result empathy for innocent civilians spread through a population,
then this would make it harder for people within that population to shrug their shoulders and agree that well these things do happen in war.
Which in turn makes it more difficult for anyone in power who wants to support (or take) action that causes mass suffering to innocent civilians.
So who benefits from hiding the reality?