But that is not true. An attorney will try that, while someone on a jury might not even be aware his believe in a nuclear family is used to paint the victim as a slut. Being aware of your own biases and noticing others trying to abuse them will require education and training. Random citizens won't have the time for that. A professional judge (should) take that time.
Do you take you medical advice from random citizens as well, since it is harder for the pharmacy industry to influence them? I'd want to avoid corruption. Transparency helps, but comes with its own issues... if at all possible. I do want a system that avoids centralized power as much as possible but still lets trained experts do the job. There's got to be a better balance.