To dream of kidneys represents your ability to feel that nothing is critical or that there is always a backup option.
To dream of injured may reflect feelings that there is only one way out of a problem and it’s out of your reach. Feelings of prolonged stress or risk. Having to be very careful all the time because your options are sensitive.
To dream of removing someone else’s may reflect your wish inflect a permanent sense of risk or stress on an enemy. Wanting to remove someone’s safety net or backup options. Wanting to inflect a sense of constant seriousness on someone you don’t like.