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There should be no need for freshclam, clamd, or clamav-milter to create a PID file.
There is a very minor security concern that the PID file is located in a user-writable directory in that a naive service manager might kill the wrong process if the PID file has been modified.
Granted, these Docker images do not have a service manager which operates in this way. However, I believe there is no harm in removing the PID files so as to eliminate the hypothetical risk if one were to use those PID files.
Refs: