White Knights are NOT harmful. They're funny.
not when they tell the targeted person to kill themselves- it can really have an effect sometimes, but they are pathetic, yes. ;;
Yeah, sometimes they're harmful.
LOL xD I guess they can be. They must have nothing better to do.
It's funny how they're like "WHY YOU NO TAKE ME SERIOUSLY?????!!!!!!" but in text talk.
"y u no take me seriously? D:" Yeah, it's amusing. 
I have a playlist of more examples of what white knights are also like.
m.youtube.com/#/playlist?list=…
m.youtube.com/#/playlist?list=…