I'm pretty horrified by the situation - it is a clear hate crime, and the body-count is ridiculously high. At the same time though, I not only see this as a terrorist attack (it clearly is, though) by someone self-affiliated with ISIS but I also as part of a rather sad trend of the mentally ill in the United States having access to weapons the likes of which most developed nations have completely restricted access to. The Bataclan attacks in France were seen as an aberration, a once-in-a-generation attack, but the fact that we have similar events to the Orlando shooting happening in our country nearly every year in terms of scale indicates that there's a pretty big problem, at least to me. I dunno man. Social programs and mental health systems have to be put in place for sure, but at least something must be done about our excessive love for arms. Because the idea that they somehow protect our freedoms seems a bit nonsensical when parity with the government's hegemony over violence will never, ever be attained.
As to the radicalization of this shooter, haven't heard much word about it. But his ex-wife from five years ago said that he wasn't too religious but was very mentally unstable and violent. Organizations like ISIS thrive off of the poor, the marginalized, and the mentally ill, and I do honestly believe that if someone were to have so much hate in them to go into a club and kill fifty innocent people that clearly there is something wrong with them. Yes, the ideology is violent and problematic but I cannot think of a way to just 'deal' with the problem - we have to deal with its roots (much like the IRA, the roots are political - our meddling in the Middle East, the marginalization of 2nd generation Muslims in the West, but also our collapsing mental health infrastructure and social safety net and whatnot) and eradicate it over the long-term. That means that these sort of attacks throughout the West are not something we're going to be able to just end, regardless of the security measures - all we can hope to do, I think, is to decrease their frequency but also avoid overreacting. I mean, last I heard, France is still in a state of emergency. That shouldn't be the case. I think, like the Troubles,this is a problem that will stretch out for at least last another 2 decades.