Thinking that because there are still people getting ill, the vaccine is useless, is like thinking that seatbelts are useless because during a typical rush-hour there are more auto injuries than there were in all of 1937 when no seatbelts were worn.
Well, yes, because there are far more cars on the roads in 2021 to crash into each other. Also, seat belts don't help much if you jaywalk in front of a car, or overtake at 100mph on a bend.
With the protection of vaccination, more people are venturing out to meet up and mingle (= more cars on the road) People are hugging more and so being exposed to more of the virus (= jaywalking into traffic) or crowding together in confined spaces (= overtaking dangerously) and so increasing their risk because they think they are safe.
No-one has ever said that vaccination is a complete bullet-proof bodysuit against the virus, only that is vastly reduces the likelihood of both infection and (should an infection get through) of how badly you are affected by it. THAT IS STILL TRUE. However, if you increase your risk, you increase your chances of catching it.
Some people will still get the virus, and some people who get it will need to be checked over in hospital and possibly kept in. Even if every single person were double vaccinated, then there would still be some who drew the short straw and were ill - perhaps due to their individual weaknesses, or their age, or how much exposure they have had.
What is not in the statistics is how long people are being kept in, and whether they are all seriously ill or just there as a precaution and to be checked over. That would be useful to know.