User blog comment:Loveable Cats/List of SML characters' antagonistic acts/@comment-32770744-20171018210811/@comment-27171758-20171019045536

Killing a baby kinda is antagonistic since it is a terrible thing to do. A protagonist can be an antagonist sometimes.

If you do not understand that some protagonists can sometimes be antagonists then why don't you take a look at http://antagonists.wikia.com/wiki/Category:Antagonist_Heroes|this.

Also, if someone does terrible things, then that technically makes him/her an antagonist.