If you look closely, the chats shared by Kolvet and (allegedly) Maguire have the same exact background (see the paw, the smiley faces, etc.).

Yeah no kidding, it’s called WhatsApp.

Context, these are cars that contained both Palestinian and Israeli people, that were destroyed by Israel as part of the Hannibal Directive.

the IDF fired on Israeli civilian hostages while they were being driven by Hamas militants into Gaza

The IDF confirmed this to be true, stating

it would not be morally sound to investigate these incidents [due to the complexity of the situation]

TLDR: Israel felt it better to kill their own citizens than to let them be taken hostage.