IF taxpayers were not involved in any way and the system was 100% freemarket, i.e. banks would take losses and shut down then I see absolutely no problem with walking away…it is between the borrower and the bank.
But because of the bailouts this is affecting everyone now so yes it is unethical.
So what you are saying is that the government is spending your money unethically? Thats an argument I can understand – even though the Govt, misguided as it may be, is just clumsily trying to choose the lesser of two evils.