“ The Greek word for "return" is nostos. Algos means "suffering." So nostalgia is the suffering caused by an unappeased yearning to return. ”
Source: Ignorance
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Ignorance is not a solution nor is it a bliss. Ignorance protects you from suffering a few things but suffering will accumulate and come to you in large scale at some point. 
True religion are those immutable principles that protect man permanently from the threefold suffering of disease, unhappiness, and ignorance 
If ignorance doesn't bring suffering to you, why would you seek enlightenment? 
The words with which a child's heart is poisoned, whether through malice or through ignorance, remain branded in his memory, and sooner or later they burn his soul. 