Not really. I was a civil servant and gave advice on this.

Civil servants aren't there to say whether a policy is good, sensible, or a vote-winner. The CS policy profeasion is there, in part, to advise on risks. Ministers decide whether to accept those risks.

There were plenty of people (like me) who would have pointed out the various risks and problems. Some of which caused policy to change, and some were accepted.

I don't think I've ever seen in recent years the CS be blamed for something like this.