“It’s his opinion and just as valid as any other.”
Not all opinions are valid. I agree everyone should have the right to their opinion - but that doesn’t mean they are all valid - far from it.
I know many who are of the opinion that the 2020 election was not stolen.
Is it their right to express that opinion? Yes.
Does that mean that opinion is valid? Of course not.
“Valid” means “rational”, “reasonable”, “sound”, “well-founded”.
Is the opinion that the election was not stolen any of those things?