OMG Barry didn't kill Dante and Baby Sara
I have no problem with Cisco being mad because he had a brother, then Barry time travels and his brother is dead. He did the math and lashed out.
As for Baby Sara, that was a stupid change and the Arrow writing team is to blame. Barry didn't go and kill the kid with his own hands. The Arrow fans should ask Guggenheim and co. why they decided to give Diggle a boy and not a girl instead of blaming everything on Barry because they can't stand that The Flash is the CW golden child.