We can't directly use the particles that are being discovered, but we can use the theories that they can confirm to be correct. By confirming a theory you can

We can't directly use the particles that are being discovered, but we can use the theories that they can confirm to be correct. By confirming a theory you can use the entire framework to come up with useful ideas. This is what happened to General relativity. If people only asked "ok, that star is a little bit off, but will that lead us to faster horses?" would look funny in hindsight.