What's so bad Obama suggesting Israel return to 1967 borders with Palestine?

Next Russia will be asked to return to the USSR borders circa 1980. Maybe Germany should be able to return to their 1941 borders. There is a reason that Israel has the land that it does, it was granted the lands in 1948. Israel added land over the years through negotiation and war. The Palestinians don't recognize Israel as a country and has continued to attack them. There is not going to be peace between these two nations ever. This request by Obama is a non starter.