A positive attitude does not mean that every idea has to be treated as wonderful
It means a positive exploration of an idea to discover and show up whatever good features it has
The next step might be to find the weaknesses in order to avoid or strengthen them, rather than using them as a means for rejecting the idea
Finally, the fully developed idea may not be used because there is a better one or because ― good though it may be ― it is not suitable
Too often we feel we have to start rejecting an idea at the beginning because we know that at the end we are not going to be able to act upon it
There is nothing wrong with being positive about an idea and showing, honestly, at the end why it is not possible to adopt it