Why did Karpov go to the bank for the money, then say he didn't want it?

I can't even say what was the purpose of Karpov going to Hamburg: is started as he wanted to begin new life with no id and no money. When he had finally made it to the conversation with banker to get the money (and start new life I guess), he suddenly decided not to take money and just do nothing, living in accidentally found flats with external help, which he takes quite ungratefully.

All in all, the movie is just stupid. And I personally have no idea what is the thought of the whole thing.

I can't even say what was the purpose of Karpov going to Hamburg: is started as he wanted to begin new life with no id and no money. When he had finally made it to the conversation with banker to get the money (and start new life I guess), he suddenly decided not to take money and just do nothing, living in accidentally found flats with external help, which he takes quite ungratefully.

All in all, the movie is just stupid. And I personally have no idea what is the thought of the whole thing.

The obvious point when he changed his mind was after his conversation with Wilem Dafoe when he said that the money was ill gotten and questioned why he dared to stake a claim on this money knowing that it was dirty money. After that conversation when Rachel pushed him that's when he stated that he didn't want it anymore.

Apart from the money the letter to his father said that the banker should get him in contact with someone (can't recall his name), but that quickly forgotten later on in the plot.

Fanboy : a person who does not think while watching.

This struck me as a gaping plot hole. He risked his life to get to Hamburg, with a note from his father (whom he already hated), which was meant solely to gain access to the money in a bank account. It wasn't Issa's idea to give the money away. That idea only came from Annabel (via Gunther), so it isn't accurate to say that he changed his mind about the money. He knew his dad was evil and the money was "bad" from the start.

Which makes the entire premise of Issa escaping to Hamburg pointless and contrived. He somehow escaped from Turkey and arrived in Hamburg by sea--even though there was nothing specific about Hamburg that would help him (since he didn't care about the money from the start). From Turkey to Germany, he could have chosen Greece, Italy, Spain, Portugal, France, England, Belgium, or the Netherlands. Nope, he chose the longest route to freedom possible to get to a specific port city for no logical reason.