This makes it more clear that he was only radicalized by ISIS quite recently.
No, it actually makes it even more complicated than it was before.
Not at all. He pledged support to ISIS. A lot of liberals seem desperate to find any other cause.
In a lot of instances pledging support to ISIS is the effect... not the cause. Normal healthy people who have a good life don't usually just pledge support to ISIS. Looking for a cause doesn't somehow magically erase the 911 call where he mentioned his support for ISIS. Don't worry this thread in no way threatens your Islamophobia.
If you look around the world, youll find that a lot of normal, healthy people have pledged their support for ISIS, so no.