Very few Witcher stories would take place if Geralt had a habit of giving up if he's up against something powerful.
Geralt has a history of taking risks to help cursed dudes who used to be bandits (he also has a history of banging bandits, but sadly there was no Sexy Ending in Hearts of Stone), I don't see what's so different about Olgierd that would make Geralt want to rob him of a chance at redemption and support a monster (in every sense of the word), especially by sitting back and enjoying the show. What is this, The Shitty Witcher 3: Lazy Hunt?!
This description doesn't fit Book Geralt one bit. Other characters from the novels describe Geralt as a compulsive hero, which is why half the time he works for free.
I can see how you could think that about Video Game Geralt, because CD Projekt Red did such a lousy job with Geralt's characterization (to this day gamers keep describing Geralt as incapable of showing emotions or quoting his made up Witcher code), but the OG Geralt? Nuh uh. Nope. No way.