It of course matters how far they went in interacting with him, but if all it takes for someone to try to bomb a building is another person online going, "do it

It of course matters how far they went in interacting with him, but if all it takes for someone to try to bomb a building is another person online going, "do it, I'll sell you a bomb", they should probably not be free and are clearly a danger. If this is mainly due to mental illness, that can and should be considered during the trial as far as punishment/rehabilitation goes, but has no bearing on the fact that they were willing to bomb a building.