“This is really going to impact institutions that we take for granted,” Internet Archive director of archiving and data services Jefferson Bailey told the Standard, “like our museums, our historical societies, our public libraries, our academic libraries — just a lot of people that keep information free and accessible and online.”
You’ve answered your own question: because one day they might not take the fire and collapse. It’s like saying it’s not the first time your old HDD has been showing bad sectors and definitely won’t be the last. That’s all the more reason to make a backup!
I agree with you that we should donate to them and make them more people-funded, but ideally you want that taken care of through public funding coming out of taxes. You can’t just sustain every single entity through individual donations.