It's like religions. Somebody who lives deep in the religion that they believing in might deny all other beliefs, and almost all religions were created from adult fairy tales (in another word, lies). But what if a religion makes people peaceful, kind, productive and healthy while strongly rejects the idea of harming the others? Is that religion bad?

Contrary to what people might think, more information does not necessarily make you more rational and reasonable. It can be the opposite, sometimes information makes you anger and hatred, while ignorance gives you the power of justice and forgiveness. That's why sometimes those who made improvement to the world were doing so from their own veil of ignorance. Nobody tell them to hate, so they helped instead.

Echo chamber is an overly stigmatize word. It's true that some people handled it poorly, thus sadly created a spiral that dragged them all the way down. But on the other hand, echo chamber can also be a useful moderate tool to keep yourself out of those harmful ideas online too. It depends on how you craft the chamber, how you use it, and whether you left the door unlocked.

I would rather use my ignorance as a vault to keep my humanity.

Guessing you forgot to hit 'copy' before you pasted that quote? Looks like you've re-pasted the same quote from https://news.ycombinator.com/item?id=30839804) :D