The dumb-ass paradox

Basically, dumb-ass time traveller finds the younger version of their best-friend while trying to prevent spread of deadly disease and 90% of the story will probably be the best-friend shouting at the dumb-ass time traveller for being a dumb-ass whilst the dumb-ass time traveller cries abut being a dumb-ass.

The fact I am yet to create an MC that's not a dumb-ass is making me reconsider how much of a dumb-ass I am myself...