Don't think like a pansy as this is about players cheating, the worse are the ones that make contact with the defender and then go down like they have been shot in the head, the defender is left standing there fuming while the diver knows he has done wrong but he as cheated to gain an advantage.
As for serious injury? you must have a body made of glass as were not talking about dangerous tackles here, were talking about contact......tell you what, go to the park and go for a wee sprint and ask someone to run alongside you, kicking you in the leg and see how hard it takes to kick you that you actually fall over without tripping you.
Of course, if someone wanted to trip you, that would be easy, which is what cheats play on, they simulate a trip, when in reality they just felt someone touch them, so decided to dive.