Any on-line petition is being recorded in a database. And any database kept on-line is accessible. The government has a Total Informational Awareness program. They can get all the information they want whenever they want. I have a 30 year career in Information systems, and I know how easy it is to get information kept on-line.
Your argument is lame and naive. A straw man argument at best.
Like gun registration, they don't have to call a gun-registration list a gun seizure list until they decide to use it as one.
So, why would you try to hide if you know they keep track of things? I prefer to stand up and be counted. Let them cower in fear, not me. I am not looking to sucker them into a fight. This fight is being instigated by them because they want to instill Communism and they need to do a Lenin/FDR to get it; crash the system then claim capitalism and freedom is bad but their solution will work better. The fight is being brought to us and we had best stand our ground.