Sure, but the players' mentality has to be different than supporters anyway.
The belief the supporters have comes from the mentality the players have. We know they're not going to think it's over, which is why a lot of us feel we can afford to believe that from the stands. Nothing supporters say on a forum has any positive or negative effect on the outcomes of games.
People (fans) can think whatever they choose too. It's not a problem. Everyone has an opinion. That's not a problem either. Some feel it's done and dusted, others feel there's an awful lot of work to be done before they themselves say the same. It's not a problem.
Personally, I like the mentality winners have. I like that Klopp barely acknowledged the fact we've just broke the record for best start ever in any top league. I love the single-mindedness of him, this team and this club. I saw how successful that approach was when we won the 13 league titles in my lifetime. I sort of admire the approach, so have sort of adopted it myself. For me, just like the club, it's one game at a time. Total focus on the present moment, because the present moment is all you can influence.
Fans have their own approaches, and they differ from person to person. Plenty have already popped their corks, others haven't even bought the champagne. It's all good. Thing is, just because a person hasn't popped his or her cork with months of the season to go doesn't mean they are a "doubter".
Like I said earlier, we've lifted the title 13 times in my lifetime, but if/when we lift this one I'll celebrate it like no other before it. Trust me, I'll be on a natural high for a very long time. Do I think we can win this title? Yes. Do I think we should win it given the position we are in? Yes. Do I think we will win it? Yes, I do. Do I think there is an awful lot of work still to do though? Absolutely. This has nothing to do with being a "doubter". If anything, it's the adoption of the Liverpool way. The humility of not declaring anything over until it's actually over. It doesn't make me/us right or wrong. It's just our approach to it, that's all. That approach has served our club so well in the past and is doing so again now. Although just a fan, I find that approach attractive, this why I have sort of adopted it myself. The ride is still deeply rewarding and joyful, I can tell you that. I've not enjoyed football so much since the 70s and 80s. 😊