There seems to be a pervasive belief that we need a reason to feel good. Since my natural state is blissful, I actually need to accept a reason to feel lousy. I choose to believe that I can never be too happy. As if being happy is the opposite of being grown up. Being too happy does not imply being irresponsible.
True happiness excludes irresponsibility.
Irresponsibility would lead to unpleasant consequences, thus detracting from happiness. My ruthless pursuit of happiness excludes irresponsible behaviors. So, since I get to choose my thoughts, and I can never be too happy, I can always chose to presume the best. It just takes practice. This works for me and for some others I know.