Isn't that likely compounded if children of first cousins end up reproducing with children from first cousins, and so on? As a one-off, those figures might be the case, but could well increase if the practice is endemic.

...quite a few people in this thread seem to be of the opinion that the UK government is banning all protest which isn’t happening here.

Best to add a "yet" to the end of that sentence. This is just one more rung to the ladder.