As I understand it (fully open to being corrected) antigenic drift is inevitable. Mutations can occur every single time a virus replicates. RNA viruses like coronavirus have the potential to mutate an absolute fuck-ton because, unlike DNA, when an RNA virus replicates it does so without bothering to check it has made an accurate copy which leads to mistakes and genetic variation in future copies. These mutations are not intentional - they are mistakes, however, evolution has the clever ability of hanging on to what is advantages to a species and the things that are not - not so much.
Seeing as mutations can occur every time a virus replicates it's pretty safe to say that potentially anything can happen at any time. With tens of thousands of new infections daily here, hundreds of thousands daily in the US, and God knows how many daily infections globally, this virus was always going to mutate and it has been right from the start. Most mutations are meaningless but occasionally a mutation will occur that has serious ramifications for the hosts - like a change in the spike protein which makes binding to the Ace2 receptor easier causing an increase in the viruses' transmissibility. How a virus is going to mutate and how it will effect us is not something we can control. The only way to stop a virus from mutating is to stop transmissions and kill the virus. Besides Trump, and a very small handful of other cockwombles around the world, that is the primary goal of every country with varying levels of success.
Although we cannot stop the virus from mutating and we cannot decide what effects, if any, that the mutations will have, what we can control is our response to it. And that is something that we call ALL control to a certain extent. If you're not part of the solution then you are part of the problem and the solution needs to be far further reaching than just dealing with this particular pandemic because unless we focus more on our own behaviour both individually and as a species, pandemics of this kind, and worse, are going to become an all too familiar reality.
I think you can blame the government for a lot of things but not for the mutation of this particular coronavirus strain.