> "Whenever nobody in a group has a different opinion on a serious subject that always seems extremely suspicious to me."

With a criminal conviction we're talking about exercising the state's monopoly on violence and coercing an individual to give up their liberty and freedom.

There shouldn't be a differing opinion on guilt. If there is, the state hasn't proven the subject's guilt beyond a reasonable doubt. If there is reasonable doubt, the person should be found not guilty.