If he was misunderstood that would be a major problem with his character arc. That’s why William Afton exists. He’s a terrible father(literally lets his daughter die even when he tells her not to and literally never stoped Mike from bullying and doesn’t care about the bite of 83 and kills his own business partners daughter)
your first point isn't even Williams fault, your second point is debunked by the fact that he didn't expect the bite to happen, and your last point was something that happened after going insane.
he promised to put his son back together, told his daughter to stay away from circus baby, and wanted to kill Michael after he killed his younger brother as seen in FNAF 3
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