Who said "I believe in doing the right thing"?

This quote is attributed to Butters Stotch.

I believe in doing the right thing - Butters Stotch

"I believe in doing the right thing"

Butters Stotch Justice

"I'm not bad, I'm just drawn that way"

"Aw, hamburgers!"

"You're grounded, mister!"

"I have to go do my chores now"

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."