Not a witch hunt for Barca. Let's look at the three big scandals this season involving FC Barcelona or it's players:
1) Messi tax case - Started by Catalan prosecutor - nothing to do with FIFA or any other club. I'd even say Messi got off easy, considering Hoeness is going to serve jail time for a similar, but more serious, offence. Messi's not the first person in sports, nor the last, to get caught for tax fraud.
2) Neymar transfer - Started by own club member - nothing to do with FIFA or any other club. If the club had just provided Jordi Cases with whatever documents he was asking, by his own admission, he wouldn't have started any investigation. Of course, you cannot reasonably expect the Spanish authorities to stay quiet after Barcelona announce that they had actually spent 80% more than they had originally declared.
3) International U18 players - Started by FIFA - the only offence you could legitimately pin at a foreign entity in football.This thing has been going on for quite a while. Lee Seung-Woo has been banned from Barca matches for a long time, didn't start this season. While a lot of things are still unclear about the case, Barcelona may have been charged and picked to be the club "that was made to be an example of" because they have probably committed the most offences (10 players!). You can't realistically expect FIFA to go after each and every club, that would be a lot of resources consumed on their side. Smarter for them to charge one club and hope the others learn from it. Anyway, Barcelona are also not the first club to be charged by FIFA on transfer issues - see Chelsea. Also, other teams may be covering their tracks better than Barca, and I've read that Barcelona did not bother to co-operate with this investigation and that might've contributed to them being banned. And you never know, FIFA may still go after those other clubs for the youth transfers.
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My point is, you cannot commit offences over and over again and then use playground excuses like "Oh he did it too, why are you not punishing him?". That's both factually incorrect and in poor taste. No need to externalize the blame (only talking to the minority who feel it's a conspiracy - I see that the majority are holding the board accountable)