Isn’t it just trying to repair the timeline the same as what Kirk did in City On The Edge of Forever though? The Borg already interfered by going back and attempting to kill Cochrane and prevent the flight.
IIRC, when they are abandoning the Enterprise E, the escape pods are on a trajectory to an uninhabited area, and somebody had a line about trying to stay out of history’s way.
If there are pro-Borg assimilating the Earth arguments, I’d love to hear them!