Everything is done within context, so there are usually restrictions to exactly what can be done. The stuff you've suggested is clearly not justifiable, let alone remotely feasible.
The outcomes of not trying to contain the spread of Covid are well evidenced, millions dead in countries that didn't act. And many millions more left with chronic illness. The health burden that will be carried in countries like India and Brazil will be greatly increased over the next couple of generations.
Are the lockdown measures justifiable? To a large extent what government can do comes down to what the population will put up with. That is one of the reasons it doesn't have mandatory monthly prostate examinations (along with that being plainly not feasible). While most of us find the lockdown at least a bit onerous and painful (if not a lot), it is quite evident that most people understand what the objective is. Around 3000 people turned up to that protest, within 48 hours there had already been 10,000 calls and emails to crime stoppers to help identify people who were at the protest. Hundreds of people have sent messages or gifts to Tobruk, the horse that got attacked (he likes carrots if you feel like sending something).
So pretty obviously most people are willing to put up with this, and want a good result, and aren't feeling too happy about the protests on the weekend.