1 + 1 = 2
If they can ask whatever they want (they had secret courts that could provide any legal request), they have a massive data acquisition apparatus, they had many backdoors they actively used, and big companies complied while being silenced by a gag order, assuming they have direct backdoors provided officially today that we don't know about, and that companies with proprietary systems we can't check can't talk about, is just common sense at this point.
Why would you give them the benefit of the doubt when the 2 last decades of track record have given you all the reason not to, and that the next step is the logical conclusion?
Lions kill gazelles. But not this specific gazelle because I like this one?
But anyway, the point is moot, they don't even need to for this particular debate. They already have a lot. The UK therefor not matching them exactly is just them using a slightly parallel road for the same result.
It's a terrible thing either way for us. But I get the logic for them.