The rule says: You cannot gain a position by using a shortcut or bypass, and Lewis did pass Kimi and didn't really give the position entirely back. What was Lewis thinking entering the chicane? It's just Kimi the worldchampion and he will jump out of my way.

Kimi had the turn. In my opinion Lewis didn't race clean during that passing manoever from the entry of the chicane all the way to turn 1 and deserved the 25 seconds penalty. I am pretty sure he knows it too, just look at his facial expression when the reporter asked him to describe the incident.
The only problem I have with the FIA decision is that they didn't give Lewis the penalty before the end of the race or before the podium. This must be painfull to win a race and then having to give your trophy back. For this decision I agree the FIA does more than stink.