Desperately trying to ID emo song/artist
 

My friend is trying to figure out what the song is and it has been driving him insane enough for me to make this account and ask strangers.

Here are the super vague clues:

It's from the 2000s
It's some sort of alternative/emo/screamo
Someone homemade a music video to it that is animated and it's some sort of cartoon characters (animals) and it's violent.
The singer used to be a singer in a different band he thinks?

THAT IS LITERALLY ALL HE REMEMBERS

It's like trying to find a grain of sand at the bottom of the ocean- but you never know who this might ring a bell for!

Only song i can think of that fits the description would be this one

https://youtu.be/eCV2h1uHx3o

The animation in this one is not home made though

https://m.youtube.com/watch?v=eDwpJOH5_Ks

This is the only thing I can think of. The video might have been fan-made though.