I think that Rasinsky organized the rebellion of Dharma and started the 'purge'. But he underestimated the 'hostiles' and it caused all his teamates to be killed. He couldn't live with his failure so that's what made him kill himself.
r u sure he killed himself? We only have Kelvin's word 4 that and u saw how truthful he was with Sayid in Iraq. Were they his bones that Locke found in the bear's cave?
Everyone on the island is connected somehow. I wonder y he had 2 die? What did he know? I do not beleive he killed himself - Kelvin is 2 slimy. Kelvin was intregal.