i have to agree, it should not have been an option, especially for your first time up. As an "instructor", you make the calls. If you are an experienced instructor, you know what the possibillities are and you assume the responsibility for the outcome unless it is totally out of your control. You begin by doing what you have too to get it within your control and a buddy box on the first flight is a "no brainer". As an instructor, you must also take into consideration the person you are helping. It is usually his plane, his money and you should never jeopardize the safety of everyone involved as well as those around you.
Besides the fact that it is a unique tool, at everyones finger tips, and with the right person, it is virtually impossible for this scenario to happen. It just doesn't make any sense to do it any other way.
Don't give up, this hobby is great, and can provide lots of fun and excitement. Just get restarted on the right foot and maybe try another instructor. Just for the heck of it.