Why would they be furious if they didn’t expect Berry to help them?? As you admit, they do expect Berry to help and they are wondering why he hasn’t yet.The Egyptian protesters are furious with the United States for not standing with them.
He will but he is such a coward that it will take some time. Once the Islamic Brotherhood is firmly in control Berry will send someone to talk to them and offer aid.
We already see that the military is uncertain which side they want to be on. It makes sense for the military to hold back because once they pick a side things will get worse or put the MB in charge.