Not because you have several layers that you are safer. If you have one ativirus, antimalware, sandbox, anti-executable, firewall, shadow defender, etc etc. This often only increases the chance of causing incompatibility between one software to another without increasing security. Do you think if I took off the antivirus from this list I made, the PC would be less secure? Does the antivirus can not only be using resources, altering the OS, sending private information (online time, your id of the machine etc)? More is often less.