When it comes to decisions this big, I always assume there's more than meets the eye.
You're probably aware of the statement Brazilian telcos made on the intent of charging according to bandwidth usage and it's public reaction. Which to me indicates that telcos are kinda desperate on trying to find new sources of revenue. And this happened not long after one big telco company acquired a big competitor. Add the fact that Brazilian telcos have already tried to shut down whatsapp before[0].
Whatsapp makes sms and mobile phone calls a pricey redundancy to anyone with access to wifi, no wonder they're desperate.
Do I have any evidence the two cases are related? no.
But the flow of events is certainly interesting.
It just doesn't seem justifiable to restrict communication for millions of people due to a single case. As in, sure, arresting a drug dealer may be a good thing to society overall, but is that worth the limitation shutting down whatsapp imposes on Brazilian citizens?
The decision may be in agreement with the law, but is it in harmony with the law's ultimate purpose? which is to protect the interest of the society as a whole?
[0]http://www.zdnet.com/article/mobile-operators-unite-against-...