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More often than not, the child not being his own is put forth as some type of defense. So far not, but it's early yet.

Can you explain this further?

I'm envisioning some kind of, "Well, male lions immediately slaughter the young of another male after they invade a territory and co-opt the female."

Here's an example from a January 2006 NY Daily News story about the horrific abuse and murder of 7-year-old Nixzmary Brown at the hands of her stepfather:

When detectives at the 79th Precinct stationhouse grilled the stepfather, he told cops the girl was "wild" and "tormented" her siblings, pulling their hair and throwing food on the floor, sources said.
To punish her, he locked her inside a bedroom or tied her to a chair or other piece of furniture - often at night, sources said.
"It wasn't his kid, so he thought she was disrespectful, wild," a source said. "So he'd beat her and wouldn't feed her, locked her up in a bedroom, but he left the other kids alone." Rodriguez has two children with Santiago, his wife, sources said. Investigators believe she participated in the beatings, sources said.
http://www.nydailynews.com/news/2006/01/12/2006-01-12_bound_beaten_starved_killed_stepdad__mom_print.html

This current case in Oklahoma has it implied:

Hernandez told investigators that the death occurred after he and his girlfriend, Jamie Gould, had argued in their bedroom on the afternoon of Aug. 12.
Gould reportedly left the home, leaving her son alone with Hernandez, according to an affidavit.
Hernandez told investigators that while "very angry" with Gould about their relationship, he began kicking Kelynn in the back, records show.
http://www.tulsaworld.com/news/article.aspx?articleID=070825_1_A13_spanc66077

I know, sadly, there are more instances like this out there of terrible crimes against non-biological kids of the abuser while the biological kids are left alone. It's okay for lions to do this because God made them as wild animals, but He didn't make these men as wild animals.