Even if there was trust sufficient to accept any arbitrary mRNA as the proper target without testing logistics doesn't turn on a dime. Meanwhile here in the real world we have many idiots who think mRNA modifies their DNA.
Well it kind of does the same thing that modifying DNA would do, but without actually modifying it, so I can't really hate on people for that. But I don't care that much if other people get it. I want it for myself.