Now let's go back in time to 1984, before the Berlin Wall demolished. East Germany was highly suspicious of everything, notorious Stasi has used many strange ways to interrogate the "Suspect". Maybe you can count Eavesdrop as the regular way accordingly.
Telephone has brought the terrible news that Albert died, the other side, Deryman shocked and grieved. He can do nothing but play piano (Beethoven's "Appasionata") to mourn him and as an outpouring of grief, then says: "Can anyone who has heard this music, I mean turly heard it, really a bad person?" Behind the wall, Wiesler was full of tears and lost himself in thought ever since.
Beethoven has urged people to fight for freedom and happiness in his era, just like the protagonist and his associates in this film. And Wiesler, who works for Stasi for decades, finally has a chance to read those banned books and hear suspect's true feelings, he come to the realisation that they have been misunderstood and persecuted.
What makes freedom exist? Limitation. What makes liberalism exist? Dictatorship. Always antinomy. Perhaps you can choose to show to people either kind or the opposite, but ask yourself, what'd you do if there is someone treats you in your way?
Wiesler waking on the street casually, he saw Deryman's Novel "Sonata For A Good Man" in sudden, he has no idea the book is about him, he walked in and when the page turned to "Dedicated To HGW XX-7, In Gratitude." We can see the joy inside Wiesler's chest, and said proudly:"No, it's for me." The subtext is: what I did is worth.
Undoubtedly, the German has done the best and the worst.