Pneumonia, flu and many other diseases are, and there are many other things that could be mandated to prevented or improve ones chances of getting cancer and/or heart attacks taht have better science to show improvement.
But we have vaccines for the flu... which make it far far less contagious and far far less dangerous.
"Pneumonia" isn't spread by a single infectious source. In fact, you can develop forms of pneumonia entirely without any source of viral or bacterial infection. (known as aspiration pneumonia). Flu causes death most often by causing pneumonia.
For that reason -- Flu and pneumonia deaths are often combined statistically. The US has 50,000-60,000 pneumonia/flu deaths per year.
The US has already had over 130,000 Covid deaths in 6 months.
We do lots of things to reduce the chances of cancer and heart attack: We have lots of limitations on smoking. We have limitations on radiation exposures. We develop medications for treatment.
So the logic of "lots of people die from other causes" simply holds no water.
But I find people get lost in statistics, which creates emotional distance. The deaths aren't "real" if they are just numbers.
So look at your family -- pick 2 family members over 65, and 1 family member between 40-65 (among all your uncles, aunts, cousins, parents): Kill all 3 of those people off. Now, pick 2 more people in your family between the ages of 30 and 65, give them a permanent fatigue syndrome and lung damage, reducing their life expectancy by 10 years.
And let's assume you're not immune either, so go ahead and give yourself a month totally limited in bed and sick, with the addition of 2 years of shortness of breath, 2 years of "temporary" but significant lung damage.
So if it's a choice: The scenario I just mentioned but non-essential businesses keep operating mostly normally...
OR... close non-essential businesses for 4 weeks-- but those harms don't befall you and your family members..
Now which do you pick?
Or will you say, "we shouldn't take any more preventative measures.. I don't care if several of my relatives get sick and die"