As we all know, the arm of S'pore's law can be very long if they wanted it to be. I am quite sure that if the State expends as tenaciously as they have on Opposition members the same energy and resources on Phey Yew Kok, they could bring him back for trial. LKY still has to account for his 'disappearance'.
There was nothing to fight. They were out to destroy him. Even if he fought, it will not be fair fight. Phey Yew Kok, the fugitive PAP MP was allowed to go to Taiwan to have new life.