For efficiency and speed, that’s why! The faster we want or need to do things the higher likelihood we make a mistake – like running too fast over rough terrain, or playing your instrument at speeds beyond your current capabilities. So, sometimes we come to conclusions too fast because it would just take too much darn time to come to the, say, right answer. Better to just go for it and hope for a probability that you are right, otherwise, oh well, you made a mistake. So don’t take yourself or others too hard when making mistakes – be forgiving. This actually is at the root of common wisdom like “better to love and … then…”; “to err is human”; “take chances”; etc.