There are only a few things beyond our control, and what goes into our unconscious mind should not be one of them. According to Collins Cobuild Advanced Dictionary of English, Your unconscious is the part of your mind that contains feelings and ideas that you do not know about or cannot control.
If our unconscious contains this feelings and ideas we don't know about or could control, what put them there or how did there get there? Your unconscious mind wasn't a blank slate when you were birthed. There were behavioral patterns,cognitive feelings programmed in you, knitted in you in your mother's womb - this weren't things you picked up. For example you weren't taught to suck on your mama's breast, neither were you taught to cry when you felt pain or needed attention.
But you see, as we grew, messages and external influences began to be communicated to our unconscious minds, this messages we could perceive or not perceive; subliminal messages and influences seemingly beyond our control. This is true to us when we were but children - as in that stage, virtually everything that crossed our paths we picked up - but should this be said or seen of us as mature adults? You could say well, if most of the messages getting to our unconscious are subliminal, isn't it beyond our reach to control? Well you are correct; I couldn't agree more, however lets reason further together.