If you have a "normal" family without major skeletons in the closet, then it's probably not a difficult decision to make. If, on the other hand, you've got some fairly sordid family history (particularly if that history is relatively recent), it's a bit more complicated to decide whether you should reach out to any cousins you've found while conducting research.
The situation in which I currently find myself is kind of a difficult one, at least from my point of view. I've discovered that I have two cousins that I never knew about while growing up. They are my maternal first cousins.
They live in a different state (Ohio) and are about my age. The problem is that I don't know whether they have any idea about our family history on our maternal side. Their mother (my aunt Juanita Kendall) wasn't raised with my mother. In fact, I don't even know if my mother and aunt ever communicated with one another while growing up. If they didn't, then it's possible that my cousins were never aware of my mother's existence.
Since I generally know where they live, it probably wouldn't be too difficult to find a way to contact them. But if I do, I'll likely have to explain all of the ugly family history in order to tell them how we're related.
Should I make the effort and possibly disrupt their lives by telling them a lot of details they have no interest in? Or, should I take the chance that they might just be interested in learning more about their family and meeting a new cousin?