While I'd agree that stuff on Twitter was never particularly trustworthy, the conversion of the blueticks into a monetisation/paid status thing has certainly made it a bit riskier; Twitter no longer has a clear meaningful form of provenance verification. Is that actually a Reuters tweet, or a 'REuters' tweet with a paid bluetick? Most users will be (and are) fooled by this sort of thing, which was largely impossible under the old regime.
On (2), he should perhaps check _before_ promoting anti-Semitic fake news accounts; absurd to make excuses for him here.
On (2), he should perhaps check _before_ promoting anti-Semitic fake news accounts; absurd to make excuses for him here.