PITTSBURGH -- After posting a tweet that criticized Roger Goodell for a soft punishment of Vontaze Burfict, Pittsburgh Steelers running back DeAngelo Williams explained himself further in a three-minute twitter video Thursday:

Here are my issues w/the NFL's illogical fine system and w/Burfict (we can't grow strong as a players union if we're not for each other!)... pic.twitter.com/cvNcfGvSON

— DeAngelo Williams (@DeAngeloRB) October 20, 2016

The NFL fined Burfict $75,000 for his actions in the Cincinnati Bengals' loss to the New England Patriots; he went low on Martellus Bennett and appeared to stomp LeGarrette Blount in a pile.

Williams expressed discord with the NFL's punishments, specifically holding out players for uniform violations or smoking marijuana.

"However, it's fine for somebody to go in and purposefully try to hurt someone," Williams said. "I don't get it. ... He just got fined, no ban."

Players are growing weary of Burfict, whose dangerous play has resulted in a three-game suspension and more than $800,000 in fines over five NFL seasons.

Burfict's hit list includes a vicious head shot to Antonio Brown in last season's AFC wild-card matchup.

Williams and Burfict have verbally sparred on Twitter before, but Williams doesn't mention Burfict by name in a video that focuses on the bigger picture.

"We're already in this fight, this struggle of NFL players versus NFL owners," Williams said. "Why would we self-implode with a player of our own that's one of us trying to hurt one of us?... I'm trying to figure out why one of us, a football player, would purposefully try to hurt another football player in hopes to gain a competitive edge. That's crazy to me."

Williams wondered aloud how teammates should handle a known offender -- "do you still back him up?" -- and points out the implications of the behavior.

"It's beyond costing you games," Williams said. "Not only that, you're putting other people's livelihood, how they take care of their family, into play."