The black hole death problem

at 2:25 you said that high energy particles would distort the spacetime around the event horizon. I have 2 questions about this:

1) Why would they distort the spacetime anymore then the other high energy particles that we know are already there?

2) Why is distorting the spacetime around the event horizon such an issue? Basically, so what if it gets distorted? For all we know once we actually see a real black hole up close, the spacetime around the event horizon really will be distorted. Based on the measurements we've made so far, how can you be so sure that the spacetime around the event horizon isn't actually distorted in just this way?

Thanks to anyone who takes the time to respond!!