People rarely ask questions with a genuine desire to understand. Instead they are often looking for reassurance about their own views, an opportunity to vent, to catch you out, start an argument, etc.
In such cases your answer is supposed to be brief – so they can quickly move in their anticipated direction. This seems especially the case around Covid injections.
Giving more than one reason throws a spanner in the works.
.. and Dr. Simon Goddek forwarded some extra reasons a private Telegram user shared: