More, the "it's somebody else's fault" thing:

[....]

A very different view of conservatives and the political right emerges in Schlenker, Chambers and Le’s paper:

Conservatives score higher than liberals on personality and attitude measures that are traditionally associated with positive adjustment and mental health, including personal agency, positive outlook, transcendent moral beliefs, and generalized belief in fairness. These constructs, in turn, can account for why conservatives are happier than liberals and have declined less in happiness in recent decades.

In contrast to Napier and Jost’s “view that conservatives are generally fearful, low in self-esteem, and rationalize away social inequality,” Schlenker, Chambers and Le argue:

Conservatives are more satisfied with their lives, in general and in specific domains (e.g., marriage, job, residence), report better mental health and fewer mental and emotional problems, and view social justice in ways that are consistent with binding moral foundations, such as by emphasizing personal agency and equity.

Liberals, Schlenker and his co-authors agree,

have become less happy over the last several decades, but this decline is associated with increasingly secular attitudes and actions (e.g., less religiosity, less likelihood of being married, and perhaps lessened belief in personal agency).

They go on:

Conservatives generally score higher on internal control as well as the Protestant Work Ethic, which emphasizes the inherent meaningfulness and value of work and the strong linkage between one’s efforts and outcomes, and is positively associated with achievement. Liberals, on the other hand, are more likely to see outcomes as due to factors beyond one’s personal control, including luck and properties of the social system.

These differences have consequences:

Perceptions of internal control, self-efficacy, and the engagement in meaningful work are strongly related to life satisfaction. These differences in personal agency could, in and of themselves, explain much of the happiness gap.

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totally different take from an Australian sociologist: they think they are happy but that's because they don't even know reality?

I think this about immigrants is highly related, as regards the U.S.,including that many more are voting GOP because they see progressives as too negative about it and even hurting the potential with the things they propose: