"Toxic" individuals drain our energies and create distractions from our own personal progression. They also feed on our vulnerabilities and despise what strengths we possess.
Regardless of what a toxic person's "agenda" is, we have options, even if they aren't pleasant. You may opt to engage in some strong counseling therapy in order to sort out your feelings with regard to your own personal experiences and to help you process through the grieving process of your experiences.
I type this because I have an adult child who is 100% sociopath and it was an intensive grieving process to surrender him to his own choices and actions. No parent intends to bring a child into the world to develop into a toxic individual, and we simply do not have the power or control to help or "fix" them. We only have control over our own choices and actions.