You make a good point, and that is a problem that's ultimately very difficult to get around. It's hard to figure out how to protect the judiciary from retaliation such that people who aren't guilty will be found not guilty on the evidence and facts and the judge won't be afraid of retaliation for ruling against the prosecution, without giving them ultimate power and creating stupid loopholes. But ultimately I think we may have a clash of principles here, where most communists tend to prefer that the guilty be caught and punished even at the expense of the innocent, while I believe it's better to let a few possibly guilty folks go free, than lock up or execute one innocent person. (Also, I think show trials are stupid and the government ought to be humiliated if they hold a massive spectacle of punishing someone for an egregious crime but the evidence doesn't hold up. And that person can't be acquitted on the facts if the judge is afraid of reprisals.)