Although it is the case sometimes that the passage of time does not heal wounds, but makes them fester and never heal.
It slightly echoes Khan's rage - which didn't subside but at least was focussed, or even Ben Maxwell's in TNG's 'The Wounded'.
I certainly agree that Nero motivations are not expressed in the best way. But I can follow the case that time has not made him any less angry and calm.
Being forced to wait so long could have actually increased his determination, because he would not start until Spock could witness what he did.
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist