When you're talking to an open source dev, just remember that they are literally giving you their time for free, and they are people who don't like to be treated poorly.
Edit: Just to be clear, I don’t mean any ill will toward the guy. He’s frustrated and he’s just taking it out in the wrong venue at the wrong people, but that doesn’t mean he’s a bad person.
Edit 2: The reinstalling he’s talking about is NPM. So just running npm install. It’s because he tried removing the node_modules directory, which is a reasonable thing to do, but it means you need to reinstall the modules with that command.
The software is almost certainly provided as is, with risks assumed by the person installing it.
Still, I doubt any dev wants a catastrophic outcome and takes steps to avoid that or warn the end user if the code is more likely to bork something.
I don't think it's unreasonable to expect the dev to do their best but it's also not like you can sue them and win, most likely.
Your earlier comment was the exact opposite in most people's eyea.