It sounds like you have a bigger issue than SSIS.  If the users have query permissions to the database (even if you could shutout SSIS), what's to stop them from querying through SSMS or Excel?  They still will make incorrect inferences or incorrect conclusions if they don't understand the data.

Are they querying against a transactional system?  or a data mart/warehouse?  If they are querying a transactional system, you could create a data mart to give them the ad hoc access they need, but give you some control over what they see.  If they are using the data warehouse, could some additional training help them understand the data?

Good luck,
Rob