Because even with crises, over the long term the only direction is up.
Its probably not so much that people trust it but either you invest broadly (index funds) and trust long historical data that the likely direction is up or you think you have more information than other people and can beat the market.
Its probably not so much that people trust it but either you invest broadly (index funds) and trust long historical data that the likely direction is up or you think you have more information than other people and can beat the market.