(1) Lonely, insecure men are phenomenally vulnerable to toxic propaganda. The internet makes it easier than its every been to access anything-and-everything--nazi race theory, 4chan "meninism," white nationalist manifestos, etc.--and so we see an increasingly large number of lonely, insecure men being radicalized through the internet.
(2) Trump's rhetoric and policies have made him an icon to White Nationalists around the world. Trump being elected president of the United States has emboldened them to act out in ways we have not seem them act out in decades, because it makes them feel like their beliefs are sufficiently mainstream that they don't have to be coy about it anymore. (2) is not false because (1) is true. (1) is not true because (2) is false.
Both statements are true, and neither negates the other.
Also--Teachable Moment. This is What Implicit Bias looks Like:
Same Publication. Same Editors. Cover When White Supremacist shoots up a Mosque vs. Cover When Jihadist Shoots up a Night Club
See what they did there?