Korra is consistently portrayed as a hotheaded easy to rile woman who always thinks she has to personally solve everything. So yeah, it might be stupid but it is a consistent reaction, particularly since Zaheer made her feel weak and vulnerable. I kind of like this kind of reversal of expectation. She behaves more like a teenage boy hero. It's also a big contrast to Aang, I presume.
And they fought the band to a standstill although being completely surprised and with korra incapacitated. Not sure if it is an unreasonable if simple expectation that they plus Korra can take them.