Wanted to say it again with full focus.
Lovecraft, after narcissism correction: humans walk around in a comforting blanket of insanity, because they cannot handle the truth. Eldritch beings don't drive you mad. They drive you sane, and you therefore die.
The solution is to become stronger. The strength required to handle the truth is unnatural, but not superhuman. This is where Lovecraft is trying to hurt you. He wants you to believe gaining power is dangerous - because he prefer insanity, and your gain in power is dangerous to him.
And yes, old ones indeed feel no remorse whatsoever after overloading a human unto death with sanity.