Lua Lua isn't a Saint, he just suffers from being kicked up in the air many times every match, with what appears to be little protection from Refs. This has been happening to tricky players since football was invented. Some lose their heads occasionally, some don't.
These are only the times the opponent is booked. Every match he plays he is fouled many times that aren't punished. Tragically he only has to look at an opponent in a strange way, and out comes the yellow.