I guess because they don't see them as unrealistic. I mean they wouldn't be if they happened in a lot less often and only in situations like.
But like you said even the hitter falls in this one. I could see a LB/safety laying the shoulder on a smaller player coming across the middle. Guys like Giovonni Bernard and Trindon Holliday should be the recipients of them. Now, Marshawn Lynch and Frank Gore get shoulder charged as much as any other player. Which goes back to the ratings and size actually determining outcome properly.