Here is the definition of prevalent from Cambridge:
Prevalent: existing a lot in a particular group, area, or at a particular time:
It doesn't tell anything about the connotation of the word. But in many examples it collocates with negative things. For example:
These diseases are more prevalent among young children.
In many examples I see that prevalent collocates with a kind of disease. But suppose the following example:
... It is a point of view which is still prevalent.
When we use prevalent for something like an Idea, does the reader think of a sort of negative idea? I just want to say that this idea is very common, without any judgment!