The creation of a space based fleet will be a great benefit because of the various roles the space ships could fill that planetary based fleets cannot. Besides, even if the proposal is denied, technology will still continue on, eventually leading to the creation of a space fleet anyway. That is how technology works, an impossible dream becomes a probable blueprint.
Humans are monsters, we will never change, we will always want to claw out the throats of those with a difference in opinion, we will never be in an age of peace because of our lust for war, poverty will continue to exist as long as monetary needs exist. We rape, enslave, and conquer with no regards to others. We live by the sword, and we will, justifiably, die by the sword.
Hope is for unrealistic idealists. Pessimism is your friend.