I'm not angry, Lucca just full of despair! If everyone had the attitude of masks being totally useless, we shielders will never be able to go out. 
Yes I am being selfish!
I did everything I was asked to do, so as not to put a burden on the NHS, which I certainly would have done, if I caught it. Unless you have been shielding, you have no conception of what it is like. It is not the same as self isolating or being in Lockdown. It's the implication of why you have to shield and the extremely high risk of dying, the implications of being advised to discuss with loved ones whether you wish to be resuciated or not, the postponement of urgent treatment etc, etc...
We should all be pulling together and showing a bit of humanity.
If everyone does their bit, we might actually get back eventually to some semblance of normality.