Would the Diana I know from the comics of the 60's to today really dismiss Red Tornado's sacrifice so out of hand and with such cruelty? I do not think so.
The only way I could believe that Diana was so human-centric was only if she knew what none of the others did; that Reddy was not at all sentient, but rather was just an incredibly complex machine that mimicked being self-aware, tiny metaphysical tornado elemental soul notwithstanding.
So this is either Meltzer bulldozing ahead with mischaracterization or a retcon that shows a more hardened, practical warrior princess.
No cookie for Brad!