Double-vax reduces risk. It is not a binary safe/not safe thing. Hearing that the vaccinated caught Covid and died, and then weaponising that is to set up a straw-man argument that vaccines don't work. In the UK, you would expect many deaths amongst the vaccinated. We don't have a medical intervention that gives 100% protection.
Sadly, in the UK we have one of the worst Covid situations on the planet. Yesterday, we had nearly 50K new cases, which is the second largest in the world. Considering that we are the 21st most populous country on the planet, I would have hoped for better figures. Perhaps it is peoples attitudes. I heard that the Brits are much less likely to wear masks than their counterparts on the continent (runs for cover!). Also, we have more obesity in the UK - a risk factor. Not sure if we get more flu in the UK than on the continent or not. That would be perhaps a good indicator of whether there is something about the UK that makes us especially vulnerable to contagious pathogens or not.