I agree that, unless you have specific concrete reasons to think a public health agency is distorting the facts or making decisions based on politics and ass-covering instead of optimizing for health, you should trust that agency. However, once you have concrete reasons to think that the public health agency is acting on politics and not science, you should not continue to blindly trust them.

There are other sources of information besides the public health agency of your particular country, for example public health agencies in other countries, or directly looking at the stats and research papers. In this case, looking at the stats makes it blatantly obvious that your risk from the J&J vaccine is much, much lower than your risk from getting COVID, so if your choice is "J&J" or "no vaccine for another month or two", you should probably pick J&J.