What I think includes the following...
That Hamas cannot reasonably be left in power. They have been responsible for a horrendous terrorist attack and need to be brought to justice.
That the taking of hostages and the reported ill-treatment of hostages is horrendous. Any path to peace must not forget them.
That there is a sustained pattern of conduct within this military operation which does not demonstrate a particular concern for minimising civilian deaths and injuries. There have, in relative contrast, been more targeted strikes elsewhere to eliminate key figures while keeping civilian casualties low. This, plus what is widely known about IDF military capabilities, suggests that the pattern in Gaza is reflecting intention rather than incompetence.
That there is evidence of civilians being ordered to evacuate to areas which were designated 'safe zones', which were then bombed.
That there are extremely concerning reports coming from multiple sources, of actions such as the deliberate targeting of civilians, the executions of healthcare workers, the destruction of hospitals and other critical infrastructure with no firm evidence to justify this.
That IDF soldiers, apparently of their own free will, are posting on social media about what they're doing, with sustained patterns of behaviour strongly suggestive of a widespread culture within the IDF operating in Gaza of dehumanisation and potential war crimes being considered acceptable. Long before this particular military operation, 'shoot to kill' orders were being given in relation to children who posed no threat and there were orders to maim people to leave them with visible, lasting disabilities. Long before this operation, people were being crushed to death with armoured bulldozers. Many of the components of this operation are not new, they're simply scaled up.
That aid into Gaza is being severely limited, by a number of barriers put in place by the Israeli government. It has always been limited, but now the lack of aid, combined with the destruction of the land in Gaza, means there is famine. Children are starving to death because there is no aid getting in.
All conflicts, especially in enclosed urban environments, are going to have civilian casualties. It is a requirement, though, for there to be meaningful steps taken to mitigate that and, where casualties are unavoidable, to have a defensible, evidence-based justification for it. There are international rules about what you can and can't do to civilian populations. Those aren't being followed and there is no evidence of efforts being made to follow them.
In relation to the WCK aid workers, it appears to be fairly widely accepted that there were three strikes, on the three cars, at different times. It also appears to be fairly widely accepted that the strikes were carried out by Israeli forces. Why and what processes resulted in this may never be determined as there is unlikely to be an independent investigation. An internal investigation lacks credibility, but will likely be accepted by other governments because it would be politically convenient to do so. People will have their own theories and opinions.