A more interesting question is the drawbacks of taking time to scrutinize, or making more conditional statements, or waiting for confirmation. Meme direction seems to be set pretty early, and hard to move once set. It's a commonplace of politics that you have to react within the news cycle or the story gets away from you, and everyone agrees this is not a good thing.

So anyone taking the time to actually think through a bit is surrendering time, at an important moment in the discussion, to less careful people.