I don't care that she killed terrorists. It's just silly because the scene itself show's she faster than a bullet, but for some reason it's still necessary for her to kill them instead of disarm them? It's just a scene that's clearly being over the top for the sake of being over the top.
It also comes across like they tried so hard to have her be "realistic" that she does something completely unrealistic.
Between the terrorist scene and the ancient lamentation soundtrack that keeps blaring in the background every time Diana moves, Snyder's Wonder Woman has more-or-less become a meme.
As for what Wanda did, she brainwashed an entire town essentially turning them into human puppets who where partially aware of their actions under her control (a dream-like state basically), and had children be separate from their parents and locked in their rooms for several days until she needed them for her sitcom...