My take on it is that they have fannied around so much with measures that make so little difference, we've all got so pissed off that we're not doing the big stuff.
Things like masks in shops - why, if we're told that an "exposure" is 15 minutes with someone, do you have to wear masks in the supermarket? Pointless and contradictory.
The real risks are visiting people in their houses without socially distancing, or picking up covid from the person in the next bed in hospital.
But because they've overloaded us with more and more and haven't dialled back on ANY of the requirements, people are just thinking bollocks to the lot of it and that if they want a few folk over for a drink on a Friday they will. Compliance is on the slide.
As for the masks in school - I know it's just anecdote, but 12 of my daughter's S4 friends were sent home last Monday after a boy they had sat in a class with the previous Thursday/Friday had tested positive. None of them have developed symptoms over the last 10 days and none of the families have either.