I think you are being a bit dramatic, however what you describe does happen to some extent. When it does, its either a management failure for not responding to the senior software engineer voicing concerns that his/her time is not spent in the proper proportion between work/mentoring, or, it is the fault of the senior software engineer for just sitting there, refusing as much as possible to help the less experienced co-worker, whilst not properly communicating it upwards. It is certainly not the fault of the one asking the questions.