Because some are bots.
Have you ever looked at your server logs at attempts to login to your server? Don't do that if you freak out easily. You will see certain IPs hammering the server repeatedly trying to get in constantly (IP changes after every minute long attempt). They all just hit it within one minute increments and try a whole lot of usernames and/or passwords. It goes on all day long. Just because they don't get in the first time, doesn't mean they give up.
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