Antispam Logic

I am trying to understand the operating logic behind the Antispam toolbar. Why is there a "Is Spam" and a "Add Spammer" button? Most other software only have one button for a spam message. The typical logic of AntiSpam software is to say: if an item enters my Inbox that is spam, I should push a button that says "Is Spam" Then the email address gets added to a spammers list AND the email goes into my Deleted Items folder. BitDefender makes you click "Add Spammer" to add it to the list and then click "Is Spam" to move it out of my inbox. There really isn't any need for all the extra buttons that clutter my toolbars. My advice is to get rid of "Add Spammers" and "Add Friend". The logic of these buttons is redundant to the "Is Spam" and "Not Spam" buttons. Am I missing something?