Sure, he was in a tough situation, and I'll admit I don't know the entire backstory of what led up to this man's suicide(although there is no shortage of information on the HN front page as of late), but there is nobody that can be held responsible for his suicide other than himself.
He was an extremely dedicated political activist. I'm pretty sure that was a big reason for of his decision to end his life, and to end it on the 2nd anniversary of his arrest. His suicide has brought more attention to this case and corruption in the justice system than he probably would have been able to do if he were still alive. Of course he was struggling with depression and who knows what other problems, but his death seems strategically planned.