One thing that's always seemed strange to me is that if the last defender takes the guy down he's deemed the last man and a red is given.
But then a keeper can take someone down as he goes by, then gets a yellow because there's a defender back on the line to cover.
Surely beating a goalkeeper 1 on 1 is a tougher task than having just a defender on the line to beat? (unless it's Steven Taylor, obviously)
Always think a penalty is enough in those situations anyway, a red card and a penalty at the same time is too much. Unless the foul is cynical, but often a defender or keeper just gets to a 50-50 ball a moment late and as a result his team both lose a man and most likely lose a goal too.