"That's a good question, and we can only guess on that. Maybe Piper's racism was subtle, and never blatant enough to justify Bad News risking his job by confronting him."
I'm thinking that's it, Andre had some political stroke like Piper but Bad News has justification for fighting Andre if they try to discipline or fire him afterwards. Piper was just careful enough to avoid being blatant, but still obviously hate black people. Kind of like this other guy I know of...
WWE.com: CM Punk
"It's not surprising that CM Punk cites the radical Rowdy Roddy Piper as a childhood influence"
Called Piper "the best talker ever" and "the reason why I wanted to do what I do now".