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The latter. He's not ignorant, but calculating.
The Brexit camp is in disarray, riven by personal emnity, and with arguments that don't stand up to serious scrutiny. They need to distract from this, so in classic, 'throw a dead cat on the table' style, Johnson comes out with this.
I wondered about that, but in the end I decided that I didn't think it really qualified as a 'dead cat', which, if I understand this correctly, at least has to have a small element of truth to it. The Nazi comparison doesn't, at all, and it will be defeated even more quickly than the nonsensical claims about the economy. Maybe it is meant to be a diversionary strategy, but by the continuing flurry of articles about the economy claims, it doesn't seem to have been very successful just yet.
Another opinion on it:
http://www.theguardian.com/politics/2016/may/15/boris-johnson-eu-hitler-bad-taste-bad-judgment
The latter. He's not ignorant, but calculating.
The Brexit camp is in disarray, riven by personal emnity, and with arguments that don't stand up to serious scrutiny. They need to distract from this, so in classic, 'throw a dead cat on the table' style, Johnson comes out with this.