Thanks to asymptomatic transmission random infection is exactly what can happen, hence the need for masks and social distancing, though those precautions are not the be all and end all.
We still don't know for sure if asymptomatic cases are a major source of transmission, but they certainly have attracted a large proportion of blame amongst the public. Very possibly many of those asymptomatic cases may simply be people whose immune systems have reacted swiftly, and those that test positive may actually be only displaying the protein fragments following T-cell intervention in shutting down infected cells.
It is also notable that one of the key policies amongst many governments is to limit household visits, which suggests very strongly that this is where they are being told transmission is highest, which is not random at all.
As to freedoms ISTM that younger people are saying that they should not be expected to give up any of their freedoms, even temporarily, but older people should have to give up most of theirs instead. It may be that older people statistically have most to lose but younger people are not immune to serious illness from the virus and even though recovery is much more likely it can be protracted and there is a risk of significant long-term damage to vital organs. This should not be dismissed lightly.
Unfortunately the young cannot be expected to shut down their lives pending a solution, or partial solution that may not be forthcoming for many months or even years. Many of the most vulnerable are deep into their retirement days and as such at least have some level of financial security. Indeed many need younger people in work to keep taxes flowing to pay for pensions, care & health services. There is not a bottomless pit of money the Treasury can just dip into, sooner or later with any full or partial lockdown scenarios the money will start to run out.
And at the end of the day, as we get older & more fragile we do become more vulnerable. Its a basic fact of life, we are not immortal. We don't however have to lock these people away, we simply need to adapt to ensure that we offer them as much support & information on how to mitigate for their own risks, and have systems in place for regular checks, tests and where necessary treatment. If there is anything the younger generations can do it is to feed the economy to allow more money to be directed where it is needed most.
Unfortunately we have become so conditioned to binary solutions that few people seem interested in striking a reasonable balance. In short some temporary loss of freedom is inevitable if we are to avoid collapsing the NHS but OTOH we continue to develop a better understanding of the virus meaning it may not be too long before we can find a way to live with the virus, even without a vaccine, while also restoring life close to the previous normality. But we are not there yet.
You might want to speak to the Chancellor of the Exchequer about that. Rumours are that he nearly needed the services of the NHS when the full cost of furlough & lost tax revenue was calculated. And add to that the millions of cancelled NHS treatments as a result of the partial shutdown on non-essential and even some essential services, the NHS could be facing an even bigger crisis in the coming months. By kicking these patient's treatments down the road, we now risk a really severe test that we might not be able to afford having blown more than 3 times the NHS budget elsewhere in just 6 months. So we may soon not have a choice but to get on and deal with it.