No vaccine has ever, ever been 100 percent effective. Not the smallpox vaccine, or the polio vaccine, or even the measles vaccines (though the latter was very close). Try to think where we would be without these vaccines and their outstanding 94-95 percent efficacy? Reports on 'dangerous variants' and 'breakthrough cases' make for sensational headlines and draw readers to those sources as people are often driven by fear and tend to think the worse. There's only so much the scientific community can say, and if people choose to ignore this then they can take their chances with the virus.