Because the general expectation (and current reality) is that old cars will break and be scrapped eventually. Only few remain and those few don't matter in rega

Because the general expectation (and current reality) is that old cars will break and be scrapped eventually. Only few remain and those few don't matter in regards to global emissions as they are mostly not daily drivers. They instead contribute to keeping tiny bits of history alive. I'd compare it to old houses which are often designated as landmarks. We don't demolish them just because they are not energy efficient by modern standards.