It's not so much a matter of who "knows better." There's an element of whether you trust a murderer, or are all the facts and evidence around their case, more.

Take a look at the next sentence from your linked article.

“I am pro-life personaly [sic] but it wasn’t those,” he said, using the jail’s internal messaging system. “I will just say there is a lot of information that will come out in future that people will look at and judge for themselves that goes back 24 months before the 14th. If the gov ever let’s [sic] it get out.”

You’re a fool if you think he is telling the truth.

I’d believe him if he said that before he’d lawyered up.

Now, looks like building a defense to me.