It's true, grievous crotch injury isn't something you see depicted all that often, let alone more than once over the course of a series. I'd still argue that with context brought into play, much MUCH worse stuff gets depicted on TV over here. (A lot of the torture Theon went through on Game of Thrones last season, for example; and Kev's injuries in The Smoke at least had a crucial role in the plot. Most of those Theon scenes were dragged out and didn't advance his storyline at all.)
This underlines a certain point though, which is that for American networks, virtually anything depicting "the downstairs area" as it were (particularly for men) is restricted to premium channels like HBO and Showtime. Which don't pick up foreign series much if ever, they're more interested in developing their own programming. Some basic cable nets have stretched a lot of boundaries, but not that far, and I can't see how you'd air The Smoke and edit out THAT shot in the first episode. It's the lynchpin of Kev's entire character arc. That leaves streaming options, which is what I was rooting for all along. Netflix aired The Fall without any cuts last year, and there's some very extreme content in that, difficult to watch but crucial to the plot and the tone of the show.