Nero – Star Trek (2009)
Nero initiates his quest for vengeance after witnessing the destruction of his entire planet. As a captain of a mining vessel from the 24th century, even Spock characterizes him as simply a “very troubled Romulan.” It’s understandable that he seeks revenge for the loss of his home planet.
His villainous status is solidified by his decision to travel back in time to pursue vengeance, which involves the murder of numerous Vulcans in the altered timeline. Although his attempt to harm Earth is thwarted, it’s challenging to entirely condemn him for harboring anger after the annihilation of his entire race.