Losing his innocence caused Elisha's life to change completely. Elisha went from a man who though, cared, and held strong considerations to a cold blooded killer. Elisha's killing of an innocent man whose last words were Elisha's name forever maimed Elisha's soul, making him a very cold, scared man. .
A nation can absolutely feel a loss of innocence, as well as an individual. The Holocaust destroyed not only a nation's loss of innocence, but perhaps the whole world. Any single person who saw the Holocaust first hand has forever lost their innocence. Any person who has seen pictures, or read books on the Holocaust has lost their innocence. Any person who saw the terrorist attack on 9-11 has lost their innocence. Both of these horrid times, the Holocaust and the 9-11 attack, show people the horrible extent of what the world is capable of allowing. Seeing such things happen removes all ignorance of such things, which could remove not only a nation's innocence, but the innocence of the entire world.
As I said in the beginning, violence and innocence do not necessarily go hand in hand. Elisha was not violent because he lost his innocence, but continued to lose his innocence because he was violent. The times of the Holocaust and 9-11 were not started because the people involved weren't innocent, but those who were a catalyst in said times absolutely lost most of their innocence due to the times.
Throughout "The Castle," there are many examples of regret, but not so many of redemption. Most of the regrets in this story remain unredeemed, or not shown specifically. Many of the regrets which are presented, are all an opinion on things would deserved regret, but may not have received regret rightfully so.
When K. arrives in the village late in the and is allowed by the landlord to sleep on a straw mattress in the bar, Schwarzer gives him a lot of guff about needing permission of Count WestWest to stay either in the village or at the Castle.