In that second clip, Tom is talking about how "everyone has lost their family." If the studio or whomever had allowed continuity, there should have been some mention of Chakotay's understanding of the desire to reset time to save one's family and planet--since he likely would've been thinking about his own family and planet.
But continuity was disallowed by the studio.
I understand viewers and fans being upset about a lack of continuity, and frustrated by the characters' inconstancy, but I get tired of reading about impatience with the actors regarding this. If an actor is not allowed to perform a certain way, or the editing is such that blandness is preferred, it's not the actor's fault.