I'm going to venture a controvertial idea:
The punishment given to Renault is right, exactly right, 100% even. Spying goes on in F1 all the time.
HOWEVER, the punishment given to Renault, in light of previous punishment given to teams (Mclaren) for similar acts is simply not consistent and therefore totally wrong.
What I'm getting at is that the punishment gven to Renault is right, they spied, big deal it happens, slap them on the wrists, maybe check their 2008 car or something. Whatever. This should have happened to Mclaren, but insted they got a huge fine, lost championship points and all the problems that come with that. As a result, whether Mclaren deserved a bigger punishment to Renault or not, the pnishment given to Renault is not only not consistent but HUGELY disproportional.
The FIA have dug themselves a hole, they wanted to make an example of the high profile Mclaren-Ferrari case, but then when it comes to other teams thety realise they just can't fine everybody huge sums of money...people wont watch the sport anymore if they do. As a result they feel they can't punish Renault so severly, and then they end up loosing credibilty and looking like a bunch of clowns.
I'm sorry but if the FIA cannot govern with consistency then there is plainly something wrong, and the governing body is currently not fit for purpose.