Erik,
I'm not certain we differ in our approach or just in the use of words. I have nothing against being optimistic as long as it does not result in unrealistic expectations.
What you may characterize as being pessimistic I would characterize as being realistic. Unrealistic expectations (over optimism) can lead to one becoming discouraged and disillusioned. Adopting a position that if one does not have immediate success, that's OK for that is par for the course. Eventually success will occur if one spend sufficient time (patience), and effort pursuing an objective.
When I first started in my quest to learn all I could about C. bottae, without exception, everyone including my herpetology professor mentioned how rare was the species. Would you characterize such input at being pessimistic? I understood that such attitudes simply reflected the experience these individuals had with the Rubber Boa. Such input did not affect my determination. And as it turned out, I did not have instant success. But eventually I did find specimens but it took me a number of years to learn when, where and how to find the species with regularity.
In my post, I merely tried to provide a realistic appraisal. If success is not attained on the first try or first number of tries, then there would be no surprise as this might be expected. In no way should calling a spade a spade be an impediment to making an honest effort or future efforts if someone really wishes to find the species.
And last, there is the issue of being honest. It would not be honest if I were to tell individuals that they could expect to find C. bottae the very first time they tried. I have encountered individuals that have searched for years and have yet to find their first specimen. So why would I purposely give false hope to anyone that is starting out from scratch. Despite my knowledge and experience, there are times I get skunked--there are no guaranties in this type of endeavor. But if one is persistent, eventually success will occur. I would not characterize such an approach as either optimistic or pessimistic but simply realistic.
Just my perspective. Richard F. Hoyer