What? You really don't.
If you think theoretical physics has not contributed anything, then I guess you can throw out pretty much every electronic device you have (transistors were designed based on quantum mechanics; if you have a CD or DVD or Blu-Ray drive, those use lasers which also use quantum physics). I guess you can also ask society to do away with atomic clocks (their functioning is based on Ramsey fringes - a quantum phenomenon), the GPS system (uses atomic clocks and incorporates corrections based on special and general relativity), various kinds of scanning devices including electron microscopes (more quantum mechanics) and atomic force microscopes (based on quantum tunneling), nuclear power, and medical accelerators used for cancer therapy (based on accelerator/high energy physics; at CERN a couple of years ago I learned they were investigating cancer therapy using positrons and finding them to be more effective than electrons).
Also, while I wouldn't say the technology is exactly very mature, there are already companies (like
this one) which offer quantum cryptographic systems and quantum random number generators.
If we extend this to stuff that's been invented or discovered on the side in the process of fundamental research, then please do us all a great favour and log out of here forever: the world wide web was developed by a computer scientist at CERN, initially for the purpose of facilitating communication between researchers.