By default, the "JIRA users" group is used to say "These people can log in". So if you delete it, people can't log in.
If you delete "JIRA users", you are going to need to use another group to let people log in. You can create another group (even use the same name), or set of groups, and set them up in "Global permissions" as a replacement.
By the way, JIRA is not yet up to version 7, let alone 10, and there's no way for one group to "damage" another A group is a set of users, that's it.
This password retrieval guide explains you how you can create an administrator account directly in the database. If you have locked yourself out of your instance by removing groups that provide you access to the application, this will aid you in regaining access.
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