It seems like all of these people they wind up charging probably are questionable people who wanted to do the thing and probably did some other lesser things but they probably would have given up on the big thing if there wasn't a federal agency running around doing all the "the informant says the guy is lamenting not having explosives, quick someone get him some explosives" things in the background.
Why is a terrorist and would-be assassin of a former President getting lifetime supervised release? None of the media coverage of the case, going back years, makes that clear. However, a footnote in the original criminal complaint against[2] him offers a likely explanation:
"In or around the end of March 2022, United States immigration officials conducted an asylum interview with SHIHAB. After the interview was conducted United States immigration officials advised the FBI that SHIHAB may have information regarding an ISIS member that was recently smuggled into the United States."
With a little reading between the lines of the criminal complaint, a very different story emerges: Shihab never dealt with any terrorists. He was a paid middleman between two government informants or agents pretending to be terrorists. He took their money, played along, and ratted them out to INS during an asylum interview. After that, once they realized the jig was up, the FBI arrested and charged him at its earliest opportunity - for the plot they had created and paid him to participate in, and which he in turn had informed the government about.
1. https://www.justice.gov/usao-sdoh/pr/columbus-man-sentenced-...
2. https://truthout.org/app/uploads/2022/06/Shihab-complaint.pd...