I sometimes say things like: there is a certain integrity which is built into the Voluntary Sector. I probably ought to spell out what I mean, and what I do not mean, by this.
If volunteers do not feel they are doing something worthwhile and being treated reasonably fairly, they will leave.
People work in the Voluntary Sector because they want to make a difference, and they don't want to get bogged down in policies and paperwork. (Okay, some do it as part of their recovery, and some as part of their plan to get experience and then a job with a state funded employer.)
Trusting us to do a good job would save lots of money on tendering, and on monitoring the contracts. Trust builds efficiency.
We can be fooling ourselves, thinking we are doing what is needed.
We are (mostly) well-motivated, but that does not automatically make us wise. We can be wasteful and ineffective in our work.
People working in the voluntary sector are human, too. We can be dishonest at times, just like anyone else.
The motivation of people in the Voluntary Sector is to make a difference so it is fair to start with and work with that assumption But as always, the assumption needs to be checked. The big challenge is to decide what level of checking is appropriate.