Most of the corruption in government IT contracting is more subtle; its things like government managers developing relationships with contractors and favoring them subtly without kickbacks, simply because they are comfortable and feel better working with them. The people doing it probably mostly feel like they are actually doing a public good and working around red tape, because they genuinely believe that intangibles that wouldn't be weighed properly in the formal process do weigh in favor of the contractor being a better value.

OTOH, yes, the kind with actual kickbacks absolutely exists, too.