Hi,
Respondent validation does increase the quality of your researchand is a good thing to do. Nevertheless, you will find respondents tend to think they did not say what they actually said, not necessarily criticising your interpretation, but assuming the transcription is not accurate.
Depending on what you promised them that is what you will have to honour. At the end of the day, you should remove the quotes that compromise anonomity and so on, but if you remove the quotes where 'the department looks bad', well, you will be biasing your research...
I do not do respondent validantion altogether, less problems. My advice would be do what you promised, but nothing more.