You obviously haven't read the Patriot Act
Have you ever heard the phrase "follow to money" The police get warrants to check you bank details all the time...in cases or murder, missing persons etc, the police can search things like your social media. So if you met a murder victim via a dating site, they will find you and question you
If law enforcement wants to find the guns (bear in mind they're illegal in this scenario) they won't have trouble in seizing records like gun range accounts or on-line companies' records of gun accessories/ammunition supplies. It does NOT break the 4th or any other amendment
You really need to wake up....and clearly you do not argue in good faith.
You're wrong and you know it. Your arguments are weak and totally without substance.