It also supports the enemy's claims that they are winning or even have a hope of winning when they are in fact losing at every level.
On the mundane level, you don't win a game by highlighting every mistake made on the field. You don't execute a good policy in local government by focusing only on every difficulty.
You don't run a business by only seeing every surprise as proof of failure.
That said, if you ignore the problems and get an unrealistic bravado hiding as confidence, you are likely to make large costly mistakes.
But if you look at most of the negative spamming of this war, it is actually from people who were against the policy in the first place for whatever motive who are seeking to turn the supporters of the policy against it. The problem for them is that they have been so wrong so many times that their credibility is very low. And as time goes by the grounds of their opposition keeps sliding away, so they are ever more focused on repeating the things they have left to complain about.
Ed