The original statement is that 40 infants were murdered during the Oct 7th massacre and infants were beheaded, no number given. This somehow mutated into the claim that all 40 murdered infants were beheaded so the claim could be ridiculed.
They're not, you're simply misinformed. The US and Germany have been. Countries like Ireland, Spain and Scotland have not. A lot of others have been somewhere inbetween, often as weakly-held beliefs. It's been very low on the list of priorities for people in country like Belgium, they might have been nominally pro-Irsael, but without caring particularly much. Now that Israel has been genociding for a year, except for those first two almost every Western state is largely pro-Palestine.
Unless you're purely talking about governments instead of the populace, but that makes no sense in this context of talking about social media.
“Palestinians didn’t kill as many babies or do as many rapes as people say they did” does not cut as deep as you seem to think it does. The Oct 7th atrocities were atrocities, in the fullest sense of that word.