Why do you want to delete more certificates than I selected? When you delete CA certificates (both root CAs and intermediate CAs), the certificates issued by them will also be deleted. This can be nicely seen in Kleopatra's hierarchical view mode: In this mode, if you delete a certificate that has children, those children will also be deleted. Think of CA certificates as folders containing other certificates: When you delete the folder, you delete its contents, too.
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