I can understand the staff being pissed off, tbh. Especially in this era where more and more people in the west feel empowered to use whatever platform they have to make whatever "social justice" point they want to make. And I don't think what IGN's staff did... really had anything wrong with it. It wasn't anti-Semetic, it didn't call for rallying around Hamas, it called for providing humanitarian aid to Palestinians who are facing a severe amount of collateral damage in this conflict. So much civilian infrastructure has been destroyed and there's over a million people in Gaza - it will need to all be rebuilt for them to live "normally" again.
I don't even think they needed to say something to the effect of "Please add support for Israel too" - but they could have added a statement condemning Hamas (which should be pretty fucking easy for anyone to do, especially a Western media company that focuses on mostly gaming and film news) and the statement would have seemed much more "both sides-y" and balanced.