'Unremarkable' Virginia attacker shows difficulty of fighting political violence

James Hodgkinson of Belleville, Illinois is seen in this undated photo posted on his social media account. Social Media via REUTERS

WASHINGTON/NEW YORK (Reuters) - The most worrying thing about James Hodgkinson, experts on violent extremism say, is how unremarkable the 66-year-old home inspector from Illinois seemed until he opened fire on Republican lawmakers as they played baseball.

Violent clashes between left-wing and right-wing groups at rallies and protests around the country have increased since the election of President Donald Trump in November.