Why do happy, innocent children celebrating a birthday get murdered by terrorists? Who told you that manifestations and creation has to benevolent all the time. Understanding these from our lower perspective will never make sense at all. Just look above your perception level. The universe, for example: There is constant change and transformation in the process and it does involve creation and destruction on a balanced basis. Conciousness at a higher level just keep on manifesting whatever it focus its attention forth and it does it through everything that is at all times, nom stop. And all this manifestafion can be good or bad depending just on our human judgement.
Have a clear intention. Conscious manifestation is all about intention. Intend that your vision happens at your will. Manifestation doesn’t require an effort but being focused on what you want. Intention gives a clear direction to your desire. By being focused, you say to the energy where it should go. Imagine that you’d like to start a yoga studio but your energy and focus would go on being on Facebook and chatting with your friends. While there is nothing inherently bad about that, the thing is that you lack energy that you need to support your dream. Every dream needs a certain amount of energy to manifest in a physical reality. This is where focus and intention play a major role.