It is entirely possible for 2 horrible things to have happened or be happening.
People are murdered in horrific ways in war, terror and torture. It isn't a competition where only one group can be afforded sympathy.
What is happening in Gaza, from the information available to me, looks to be on a different scale than pretty much anywhere else I've worked or my colleagues worked. Civilian casualties in wars are not new, but what is quite new (and to some pretty experienced people) is the scale, the gratuitousness of it, the lack of meaningful steps to reduce casualties (in accordance with obligations).
There are many ways in which a technologically well-equipped, well-staffed military force, backed up by an experienced intelligence agency, can achieve military objectives while effectively minimising civilian casualties. There are no signs of these being used as the norm in Gaza.
There are responsibilities under international humanitarian law to provide aid. Aid remains actively blocked from entering and then being distributed in Gaza. What is getting in is woefully insufficient to meet any population needs.
There are certain things that a power is meant to or expected to do when dealing with civilians or people attempting to surrender. Those do not include just shooting them. Instead, there should be protocols for securing a situation, confirming identities and security, etc. When civilian casualties occur or are likely to occur, there is an expectation that someone will have considered how to get these figures as low as possible. That doesn't include getting a sniper to shoot elderly women. The distribution of casualties across males, females and children shows a distribution which is closer to the general population demographics than would be expected if a force were targeting 'probable' combatants (in that case, you'd expect to see higher ratios of adult or late teen males). That suggests that there aren't nearly enough efforts being made to minimise civilian casualties.
There are some places that military forces are really not meant to bomb/flatten/shoot up. Hospitals, for example.
There is also evidence of rapid destruction of buildings of cultural importance, which is relevant as it is the erasure of a people's culture, history and identity.
If a military force is engaging in or is suspected to be engaging in those actions, some of which are violations of humanitarian law, then there are grounds to be concerned about potential genocide, war crimes, etc.
When you say children will need support, that makes me think you've never seen a severely injured child who's seen their family killed in front of their eyes. Those children need far more than a bit of support. Their lives have been destroyed. I've seen too many children in that situation.