Because it exposes that someone who is making a living capitalizing off of extremist views that spread mass harm to the populace is a hypocrite that made sure to protect herself while telling everyone else that protection is a hoax, or at the least untrustworthy and harmful. Calling these people on their bullshit is a good thing to do. It’s not the same thing as “OMG did you hear Taylor Swift broke up with her 35th boyfriend?!”, it actually has real world consequences.
America is more than ready, considering how much we spend on the military. This article is a few years old, and definitely sensationalist, but is still an interesting read-
https://www.wearethemighty.com/mighty-trending/how-long-the-us-military-would-last-against-the-rest-of-the-world/
And on top of that, the US Army just started deploying robotic troop carriers, and is finishing up remote combat vehicles for the front lines so that first contact isn’t with soldiers. Yes, we’re going to have killer robots on the front line. And soon.