"There's none so blind as they that won't see"
One of the possible motives already stated for the would-be assassin is that he viewed Donald Trump as a threat to democracy. There is only one side of the political spectrum voicing that (false) opinion and it is not the GOP.
So, to say “But only one of the two major parties is actively fanning the flames” is wholly untruthful. The Democrats and their mainstream media propaganda machine have been pushing this narrative for over a year, fanning the flames, as you put it, and encouraging radical activists to act.
The fact that you quote both Axios and the Guardian only shows that you exist in the left-wing echo chamber and regurgitate what they feed you, to the exclusion of any outside, dissenting opinions. When even ABC and CNN begin questioning the DNC Politburo narrative, that echo chamber may be shrinking and may even let a little of the real world in to illuminate the darkness. Hopefully then you will open your eyes.