In addition to what superb_dev's comment says:

> If the point is to get your gold away from the US and its president, why leave ~19% of if there?

Not all of the risk is "the USA may literally steal it", some of the risk is "UK may elect Farage who could be just as bad", and there's a non-zero chance that Trump is kicked out come November.

With a diversified portfolio, economic planning can be done in terms of probabilities; this is different from e.g. military planning, because the "portfolio" your military defends is "your nation" and this is somewhat more binary in success-vs.-fail.

> Why take gold out of Canada?

Because Canada is one of the places Trump is directly threatening.