Protection from the vaccine wanes over time. For the entire population, boosters reduce COVID-19 death/injury more than they increase vaccine death/injury.
Many European countries are segmenting the population by age and making different recommendations for different segments.
Creating policies "for the entire population" is irresponsible given that we know that these vaccines have side-effects which are more frequent at specific age spans, so I expect that the appropriate institutions are verifying the latest data and are adjusting their recommendations. This is generally happening e.g. in the UK or Germany.