My favourite explanation comes from Hayek [1]. Profit is a signal for other economic actors to move into the market to provide more goods and services. If something is profitable it means people (society) sees value in it so it is right that we would want more of it to be produced. If we say no to profit, it means we extinguish a mechanism by which society can allocate resources.
On top of this, it's impossible for resource allocation for most goods and services to be organised top-down. Knowledge about wants, desires, propensity to manufacture and supply is dispersed and distributed among billions of people (and always in flux).