Indeed, I would be extremely skeptical of myself if I ever felt 100% about anything, let alone a decision as big as this. That alone would make me force myself to ask for second opinions from as many different people as possible.
I get the sentiment, and of course one needs to be fairly sure about a thing like this, but nobody should ever feel 100% about anything. Only way that happens is if you either willingly ignore or are ignorant of a lot of things on the other sides of the metaphorical coins. Everything in life is a chaotic mess with so many layers and dimensions that it’d be impossible to navigate it with any certainty nearing 100%.
But the sentiment I do agree with. You have to be sure to a great extent, even if it ought not, or ever really even can, be 100%. It’s an impossible threshold for anyone to clear, and telling someone they have to be 100% when they never really can, or at least should be able to, is just planting a seed of doubt in their mind that is not necessarily helpful. It can be very destructive.
In general, having impossible ideals for people to aspire to is a bad exercise. We know this by heart with body ideals and acceptance for example, we ought to understand this applies to everything else too.
They probably couldn’t be happier, with a deep sigh of relief, seeing as how most of the others would look.