Why do you use the word "clever"? None of that stuff you listed necessitates intelligence. And for someone with mental problems, a lot of things you think are easy, are actually difficult.
clev·er
ˈklevər/Submit
adjective
quick to understand, learn, and devise or apply ideas; intelligent.
"a clever and studious young woman"
synonyms: intelligent, bright, smart, astute, sharp, quick-witted, shrewd; More
skilled at doing or achieving something; talented.
"he was clever at getting what he wanted"
synonyms: skillful, dexterous, adroit, adept, deft, nimble, handy; More
Clever does not simply mean a high level of Intelligence. (Both terms are also relatively subjective so making an argument to either support or disprove either is rather moot)
To be clear, you used the term intelligence, I did not. The terms I used were clever and resourceful.
The quality of being clever or having the "skill to do or achieve something" is not limited to only the legal & intelligent activities of someone with a good moral compass. A con man, for example, is only as successful as he is clever (at deceiving people)
I am in agreement that for people suffering from certain mental illnesses, some tasks may be more difficult than others or need to be completed in different ways.
However, all that is known about this man and his "mental problems" is his claims that he has them. We do not know his current diagnosis, previous diagnosis, if those diagnoses even occurred or if he simply came to his own conclusion that he had "mental problems."
Furthermore, he was quoted as saying he was treated for drugs and alcohol in prison. There was no mention of his having received treatment/medication for mental health, which is also available.
I suspect his not seeking care or treatment for his "mental problems" since his release was likely due to his simply not feeling it was a priority; other things were of more importance to him and a plethora of additional reasons, rather than an inability to attain transportation, a lack of local resources, or a monetary issue.
My apologies if my lack of sympathy of his taking himself to the T family's home to commit heinous crimes instead of taking himself to the county health department was not stifled by his having mental problems which may or may not have made such trip "actually difficult" has in some way offended you.
My intention was not to offend you personally. My thoughts on this matter, as well on many other cases here at Websleuths come from a background of having personally worked with inmates while they were incarcerated in both the federal prison system as well as the United States Disciplinary Barracks; to include those whom were dealing with a variety of different mental illnesses in varying degrees and both medicated/treated as well as unmedicated/untreated.