They may feel compromised during the research if they are required to keep research findings confidential whilst also remaining accountable to other consumers. Some researchers worry that research may expose poor practice. Again, this is no reason to exclude consumers. They are more likely to be motivated to ensure poor practice is addressed, as it is in their direct interests to do so. No one is entirely objective or neutral.
Consumers bring a particular knowledge based on their experience of the issue.
Many researchers have found that consumers keep research focused on the fundamental reasons for undertaking a research project, and ensure that it remains relevant to the needs of those at the receiving end of services. They do not find that involving consumers compromises the 'scientific' value of the research. However, everyone involved in a research project, including consumers, should be encouraged to consider where they might turn for support if the work they are involved in is personally upsetting.