Seeing antivaxxers try to use the existence of breakthrough cases of #COVID19 after #CovidVaccine as some sort of slam-dunk proof that the vaccines don't work is causing flashbacks to antivaxxers claiming that MMR doesn't work because some kids get measles after being vaccinated. 
Truly, everything old is new again. I (and my fellow vaccine advocates) have been warning that antivaxxers would use this tactic to demonize #CovidVaccine for months now, as well as others. None of the disinformation techniques used by antivaxxers is a surprise to us.
Basically, no vaccine is 100% effective. There will always be vaccine failures. The Pfizer and Moderna vaccines are nearly as effective against #COVID19 as MMR is against measles, but none of these vaccines has perfect effectiveness.
In the middle of a pandemic, OF COURSE there will be people who get #COVID19 after having received #CovidVaccine. The question is the odds. You're MUCH less likely to get COVID or die from it if you are vaccinated against it. Vaccines work, and they work very well. /end
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