Kiwi Farms recently DDoSed a suicide prevention hotline.

So you are factually wrong.

What? A quick search on the farms didn't turn anything up about that. Only thing I can find is the farm being ddosd rather than the other way around.

And for that matter, a search through google and such didnt turn up anything either. And if its just "x says they did it" without ANY evidence, then how could I believe that?

It actually doesn't matter at all. They just proved that there ARE situations that a DDoS can endanger people's lives (including more we aren't even thinking about), whether or not KF is even related in this case.

You can't DDoS a phone number can you? Maybe their website but google snippets should cache the number

I can't tell if you're missing the point or trolling, but just in case: There's only a limited number of people in the call centre. By overwhelming the queue, you prevent others reaching the service.

A huge number of companies use VOIP so in theory, ya you can if you know the servers IP.