add the comment explaining the logic back

python/private/bzlmod/python.bzl

@@ -46,6 +46,10 @@ def _print_warn(msg):
 def _python_register_toolchains(name, toolchain_attr, module):
     """Calls python_register_toolchains and returns a struct used to collect the toolchains.
     """
+    # Only the root module should have a say on whether or not to ignore the root user 
+    # error. This can be achieved by taking the ignore_root_user_error for the root 
+    # module. For all other modules, the ignore_root_user_error attr is set to True. 
+    ignore_root_user_error = toolchain_attr.ignore_root_user_error
     ignore_root_user_error = not (module.is_root and toolchain_attr.ignore_root_user_error)
     python_register_toolchains(
         name = name,