It appears there is an integrity problem. If the whole squad has the same story then I do not understand why the platoon sergeant would want to fry the Soldiers. It appears this situation would be best solved by bringing it to the attention of the commander and 1SG jointly.
If there is an integrity issue and individuals are being forced to do things that are inappropriate the command needs to know.
I would recommend that you sit down and get your facts together and then approach your 1SG and Commander in a calm, unemotional, and professional manner. You may want to request an open door policy meeting with the commander and 1Sg with the whole squad. If you are concerned about retribution you can contact the IG and discuss the issue with them. They do not need to become involved but they can offer you advice and they can assist you if there is retribution later.