bipolar pill, crazy pill whateverNero, from what we have seen , is not bipolar. On what grounds to you base that?
the point is nero is chemically unbalanced in the head.
Yes thaey are different - Nero has believable even logical grounds/motivations for his actions. He sees the Vulcans and by association, the Federation as the agents of his suffering through Spock's/The Federations actions/inactions/poor timing.
Freud: "aww classic transference"
How pedestrian.
Shinzon doesn't - his actions are against equally innocent & wronged parties (Picard & The Federation) .
His obsession with Troi was just sick.
Aww yes Shinzon is a more complex character, atleast his not insane in the membrane.
And I do believe your crush on Troi had biased your opininon of shinzon.

But that scene just made shinzon seem more human. Shinzon is a human boy that growup around aliens. He had never seen a human woman, shinzon's sexual fantasies towards troi is only understandable.