Thousands of experts would have assured you that pholgiston and the ether existed. The consensus view in medicine has been wrong lots of times: routine tonsilectomy, eggs and other foods as contributing to high cholesterol, the effects of tobacco and alcohol [...]
And how do you know all those things were wrong? Guess what, the consensus told you. So your best strategy is to always follow the consensus, unless you want to invest a decade or so becoming an expert yourself. If you want someone with an immutable and infallible truth, ask a priest or an astrologist.
Any given program will expand to fill available memory.