[j. earl carter]

In the body of the text there is no proof of the titles assertion

I agree: however, there is proof of the bias of the "researchers":

The researchers suggest that this is in line with conservative and liberal politics whereby conservatives are focused on protection from threats, and liberals focus on a positive future.

From a nuclear apocalypse to the population bomb to global warming, liberals have been focused on an extremely negative vision of the future for my entire life.

[melsec]

Yes - well said!