Nah the Salarians neutered the Krogans. They uplifted the Krogan to beat back the Rachni only to turn on them afterwards. Whether or not the Krogan were expansive or betrayed is a “history written by the victor” scenario but what the Salarians did was straight genocide. The Batarians are assholes (especially that one piece of shit bartender in Afterlife) but they’re not responsible for what happened to the Krogan.