It sounds like he needs mental help.
There’s no mention of a lawyer or any support, the guys just completely dropped himself in it. Perhaps a very low IQ or some sort of mental health problems that prison is really not going to help.
This is far from normal behaviour.
I honestly do not know how IQ and the ability to judge the future outcomes of ones actions tie together.
I do know that confessing to crimes, and then saying that he’ll try to commit those same offences upon release is not a very sensible idea if he values his freedom from prison. On the otherhand perhaps the guy thinks his being a martyr for the cause and his openness will encourage others, time will tell.