So, if I understand this correctly...
People accept that the federal government has not made the prosecution of prohibited persons attempting to buy, or of straw purchases a priority because, in Biden's words there is no time for that;
People accept that universal checks could be abused, and used to set up a national registry;
People accept that in Chicago, such a system has already been used for confiscation in the past, and that in New York, they have implicitly threatened such a possibility in future (so we don't even need to look at the UK and Australia);
People have heard from FFLs that the system, as it is, is overloaded and that adding to it will bog down or break the system;
And yet those people still not only favor universal background checks, but they can't understand why they would be perceived as offering aid to the antis, from within our tent?