He didn't do anything bad, just provided the information regarding OP's question. It is, in fact one of the best suicide methods because it's quick and painless. Half of your head will be blown out faster than a blink if done correctly.
To me there is nothing disturbing seeing it, because you get used to it. It's not a direct video, just a link, so if it's not appropiate to you, I'd suggest not watching it.