It is necessary to install the selinux policy in the initramfs so that userland is entered with the correct label. SELinuxRelabel defaults to auto, which will skip if the relabelling command is not installed and will treat failure to relabel as non-fatal. We can't force it on because root privileges are required if the labels don't exist on the host system and we would like to be able to cross-build from other distributions. Since we are already committed to relabelling on first boot there is no value in even trying to label.
System and Service Manager
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