Why would designers install software into the kernel at all (or make use of kernel software)

Since it is so dangerous, why would designers install software into the kernel at all (or make use of kernel software)? If you were an antivirus designer or maker, what other methods do you utilize to prevent virus?
https://ebrary.net/84291/computer_science/securing_systems_applied_security_architecture_and_threat_models

Answer preview to why would designers install software into the kernel at all (or make use of kernel software)

APA

949 words

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