If the two people were fired due to race, gender, or even ethical opinion, this reaction is more than appropriate.
If the two people were fired due to breaking established rules and processes, exfiltrating files or similar — this can very well backfire on minorities. It indirectly creates another hurdle to hiring a minority member if the company needs to consider that they can't viably fire them for breaking rules.
I'm unaware of good public information supporting either perspective. And both the ex-employees and Google may be restricted from publishing sensitive information to support their cause. I'm not sure how to form an informed opinion on this, honestly.