Am I the only one that thinks everyone should do a little single pilot, night fieght prior to flying 50 plus people???
Has it ever occurred to you that at some point in your life, there was likely someone who thought YOU shouldn't be where you are? That is probably true of all of us. Here's a suggestion: Wait until they actually fail the checkride or IOE before you pronounce your assessment of what they should or should not be doing. Better yet, spend a month flying with them yourself, then make your decision. In any case, it shouldn't matter what is in the back. People or boxes, 1 or 100, a pilot is either qualified, or he is not.
You'd do better to stop rhapsodizing about the way things "ought" to be, and instead focus on the way things are. It doesn't matter who "should" be in what seat. The fact is they are there, and it is not helpful to anybodyto criticize the how's and why's of it.
If you really think that the low time pilot is unsafe, then make a command decision. Refuse to fly with him. You are, after all, the Captain.