I assume that you are meaning to say here that patriotism is in some way the opposite of a true feeling of universal brotherhood. If so, here are some ideas for you.
For patriotism, the pro is that it can lead us to feel proud of our country. In that case, we might work hard to try to improve the country. The con is that we will descend into a nationalism in which we think that we are superior to everyone else.
For brotherhood, the pro is that it can lead to a reduction of conflict between countries. The biggest con is that it is not likely to happen any time soon. There is no sense wishing for it because it does not seem that we can eradicate patriotism. (It is also not clear that we want to since we might lose the good things that come from patriotism).