Agreed. Normally we fight darkness by increasing light ie more Torah learning and mitzvos. However if the darkness is too dense for us to tamper with than we avoid it altogether as adding good will increase the strength of the evil.
For example we wouldn’t eat treif food even if we make a Brocha and have in mind to serve Hashem with the energy as the Brocha here would just cause even more damage and wouldn’t elevate the food which is tied down to klipa. So too with nittel Chabad don’t learn as by learning we are adding chayus to the dark spiritual forces present at the time. (I guess the same reasoning applies to not making kiddush between 6-7)