Is it worth being ignorant but happy?

In my opinion, the purpose of life is to achieve happiness (although it is impossible all the time). Sometimes, I tend to overthink, which causes me occasional suffering because I imagine situations that don’t happen in reality. This also happens when I research politics and realize that we don’t have control over many aspects of our lives—there is 'freedom'

So, if I consider happiness to be the ultimate goal, but being too curious and overthinking harms me, isn’t the man who avoids it and lives happily, despite not questioning his reality, actually more intelligent?