Martinez plays for Aston Villa, that's why there is a furore about it.
If the England keeper did it to get England through to the next round, never mind win the cup, there would not be a word against it.
It is pretty minor compared to diving for a penalty or potentially breaking someone's leg.
And it is really up to the penalty taker to rise above it.
( If you cannot take the heat, stay out of the kitchen.)
Personally, I thought it was brilliant, like the shithousery against Man U.
It's a game - nobody died.