Not really, if you take some time you'll see she herself isn't going around and doing grunt work. A lot of money is also spent making you think she's effective at what sheis doing.
You've been trained to be reflexively dismissive of what she does. This is to direct your thinking away from the specific cause at hand.
You can verify this by the number of words you've typed in order to crap on Greta, compared to the number of words you've typed about the Crimes Against Humanity in Gaza being committed by Israel.
You will behave identically the next time she speaks up on important issues.
For you, it will always be about Greta, which will reduce your will to focus on the crisis at hand.
You've been trained.