That's what it was all about back then, the passion for the game. It's not like they made a ton of money doing it either but they played because they had a committment to the game and their teammates to go 100% every play and the passion was so evident for these guys on the field. When they say they wanted to hurt you, they meant it !

Not that being passionate means you are out to hurt anyone necessarily but back then the mindset for the game was alot different than today.