It is a cop out - an excuse to do the exact opposite of what Jesus taught and to "hide your light under a bushel."
In Christianity there is no 'I'm-keeping-a low-profile option'.
In the 'Great commission', Christians are told that they must spread the 'Word' to everybody, everywhere.
Why so? -
The Gospel message - or Good News, if you prefer - is that all mankind will receive eternal punishment for their sins - of which we all have a great many - BUT by repenting those sins, accepting that God the Son took our punishment on Himself and committing ones life to the Saviour, we shall be saved.
So if Christians do not tell people, we must accept a share of the responsibility for their ultimate fate.
If somebody's house is on fire, we tell them; if somebody is destined for hell we do not?
Just because the topic is a bit tricky, Christians are not granted an opt out!