Of course people "reason" with a conclusion in mind! You look at a roadmap. There are roads. You have in mind to get to a destination/albeit conclusion. As long as the roads route to where you are going, they work logically/topologically telling you where to go through to get to your intended destination. Hence, I referred to actual definitions/premises/roads on how to reach/get to the intended conclusion/destination. All that mattes for the most part if those premises are correct/true. And that the conclusion logically follows from them:

A.) Homosexual/Gay - sexual orientation/attraction to persons of the same gender/sex

B.) Boys - Non-Adult Males (for a brief certitude in definition.)

C.) Male priests - Men who are priests

D.) Gay priests engage in sex acts with boys

So, if priests are A and C, and employ that orientation with B, then they are D. 

And so it does.