Always, who do you think he cares about? Us? Individual shareholders?
No. He cares about HIS investors. The investors in Sarissa funds.
And when he takes it private, and then unleashes that $300M cash on reviving the company, releasing a new formulation in the US market, reaping the rewards of the eventual rollout in EU, and then shows this to his BP's, his own clients (and himself) will be the ones that benefit.
And this would actually make him a legend in the HF world if he can pull it off for HIS investors.