Quoting a story from R Meir Twersky:
I heard the following story from my brother, Ha’Gaon Hakadosh Rav Moshe Twersky zt”l hy”d, who, in turn, heard it from Ha’Gaon Rav Gershon Zaks zt”l: There was once an emergency meeting of gedolim to discuss potential responses to a harsh, cruel governmental edict. The discussion continued through the day until it was almost sunset. One of the participants suggested that they should stop to daven Mincha. The Chafetz Chaim zt”l, astonished, lovingly reproached him: “Mincha ligt ihr offen kup?! Mincha is on your mind[8]?!” The importance and sanctity of tefilah (prayer) is indeed inestimable, and yet – in certain circumstances – it is forbidden to pray!
I hope he wasn’t using that story to prove people shouldn’t daven with a minyan during Covid