Yep, with the right mentality having cashed a bet that goes on to win, it shouldn't be too hard to rationale in your own mind. We kind of do it all the time anyway.
There'll be a lot more horses you've backed where you leave the bet to run, that lose.
And others you wished you'd backed that win.
We cope with that on a daily basis.
I cashed out Mohaayed on the morning of the County last year, after having backed it in early Feb. Trainer had poo pooed the ground and the stable No1 jockey rode another horse, and Bridget Andrews was riding. Thought it had little to no chance so cashed.
Now. I regret that as I think I was just being too clever, as I was already in profit for the festival and it was only 2pts each way, so could well have afforded to leave it.
But I could cash out and re back at the same price 33's but for extra places.
So I did, but when I reassessed the race and the points above I placed a bet on another horse instead.
You gotta shrug it off.
It was probably still the right call. Sounds daft but still.