There are 16 Cosmic energies. One can surely get aggressive and impatient when he/she doesn't get what we want, it can be either direct or through VK. Universe has to give what you want or what you ask for but VK is locked by @"Sharat Sir-VK Inventor" sir in such a way that it can only reply to your positive approach. It may never do harm either to you, your loved ones and even your enemies even if you ask for or pursue it for wrong doings. So be at ease, use VK for best results, let energies get you best for what you have asked.
giving you a short example: A person wants a particular job, he is in desperate need of a job and wants a particular job only. Thinking that VK can do anything for him, he keeps sending energy for that job. Along with that job he has few more desires attached with this job in his mind and those are high income and easy working hours which is not possible in that particular job. So, may be VK will work for you where you get all three of your wishes in one request and that is a job, high income and easy work hours. But the person would think why Iam not getting that job even after sending so much of energy.
The point to understand is that VK has its own wisdom and will get you best and according your intentions ONLY. Nothing more or less. One need to have a clear intention, send energy and wait for best results to be out. So even if one gets frustrated or angry VK will work only for good.