>> As Washington still reels from the baseball field shooting of one of the top Republicans in Congress, Steve Scalise and three others. Experts on violent extremism on both the left and right tell Reuters one of the most striking and worrying aspects is just how ordinary 66-year-old shooter, James Hodgkinson seemed to be until the moment he opened fire.
Julia Heart is on the story.>> He really gave no indication as being a proponent of violence in his social media postings before this.>> As supporter of former Democratic presidential candidate Bernie Sanders who condemned the attack,>> Despicable.>> Hodgkinson filled his Facebook page with broad sides against President Trump and the Republicans, but nothing particularly radical or militant.
>> His example is one of a person who very quickly made the transition from apparently mainstream views to radical violent action.>> Security experts and former officials say isolating extremists is increasingly difficult amid a growing abundance of partisan rancor on social media.>> The Hodgkinson case exemplifies the challenge that law enforcement faces when they're trying to monitor and head off domestic extremism.
Because there's no way that you could have really looked at this man's social media profile and identified him as a threat. It's very hard to see how any more complicated surveillance or behavioral profiling system could have actually prevented this.>> Experts say most political violence in the US still comes from the right.
And while violent incidents from the radical left have grown recently. Wednesday's shooting spree may say less about the rise of anti-Trump radicals than about law enforcement's ability to separate violent extremists from people who are simply sounding off on either the right or the left.