Bitcoin is an irreversible payment system. When you pay someone using its main selling point, which is removing the need for physical presence, you are trusting that person. Bitcoin doesn't obviate trust. It obviates authority. Centralization of trust is what creates the authority that we all recognize as bad for our species. It does this by making the authority's use of coercion acceptable.
Bitcoin removes the need for authority, not trust. It replaces trust in a single body with trust in a majority. We want that majority to be healthy and varied (as opposed to largely co-opted by some authority). The replacement has two effects. 1) It is very difficult for any single body to become the (coercive) authority that everyone has to trust (like central banks). 2) It is very easy for a person to find a different single body to trust if they don't like the one they are trusting now - or even stop trusting one body and trust the majority instead, relying on #1 for protection, and taking on the responsibility of running a full node.
The philosophical foundation of a thing is ultimately the basis of its value, so I thought it useful to point out the distinction between authority and trust in the bitcoin ecosystem. I welcome disagreements with my philosophical position, as that is how I learn.