The failure and successes of the response should be distinctly studied to determine a better course of action for the next pandemic.
People want to argue for a course of action which is all sunshine and rainbows and against one that is evil and wrong. Even something totally boring like what DB to use can flare up because no one likes "in the big picture they're all a bit crappy, this one has a small chance of being better but may turn out to be a hindrance but it's not that important let's just pick one".
Once you get to the level of human health, the economy and politics there's very little chance to discuss things objectively.
Saying this should definitely be studied doesn't mean every single paper that gets published needs to only study this. It's not even clear it's really possible to get the data. How do you measure the strictness of different responses? Do municipalities publish alcohol mortality individually or is only the aggregate data available?
For sure. I bet the authors agree. But wouldn't one necessarily need to answer "Did X meaningfully change during the pandemic?" before answering "How much of that change is attributable to which specific causes?"
This is a finding answers the first question and makes it a lot easier to fund research into the second. Every political strategist, economist, sociologist, historian, epidemiologist, and public health official wants answers to the same questions as you -- even while some anticipate a different answer than you might.
It just takes a minute to get there and there's some preliminary research to publish along the way.
My response needs to be read as a response to nautilius's attempt to interpret psychlops' root comment.