Yeah, kids running around at 15kph with a ball sliding in isn't the same as guys running 25-40kph and smashing into each other, weighing twice as much.
As for the emphasis being on staying up, hundreds, thousands of contacts happen per game with players not throwing themselves to the ground, but we're awkward runners. A tiny little clip when running at a decent speed can throw you off balance and send you tumbling, currently most players do an excellent job staying up while running shoulder to shoulder.
The simple fact is pain is designed to make us stop what we're doing, it's an instinct. Getting smashed in the leg or face, small or big, a hint of pain makes you react, back away from the pain and stop and then it goes away or doesn't. Being able to run around 3 minutes later doesn't mean someone wasn't having acute pain for 30 seconds, it just means it didn't persist.
genuine bad dives are pretty easy to spot, particularly with replays, but going after players who go down and don't have severe injuries is just nuts. As above, that report is completely and utterly bogus written by a few morons and the BBC repeating it without any common sense applied.
Physical sport, players go down, speeds and forces involved means there will be pain and questioning who really isn't in pain is something that is literally impossible to do. Genuine cheats should be punished, if they dive, if they pull a shirt in the penalty box, diving is no more special than any other cheating and it can all be almost completely wiped out via replays. But there is absolutely no need to expand looking for divers beyond those who go down without real contact who are cheating to gain an advantage. Players who take a knock, it's literally impossible to judge how much pain they are in.
Also, footballers are athletes, if there were no stoppages the players would just be a heck of a lot more tired and the games would be dead in the final 10 mins, those 10 seconds here, 40 seconds there gives everyone little periods to recover, it's not bad for the game at all.