How to silence the voice that tells you you're being financially irresponsible by spending 4 to 6 years doing a PhD?

I'm very conflicted regarding applying to (American) PhD programs vs. not doing so and finding a job in industry to have more money.

The thought of doing a PhD makes me feel financially irresponsible; yet, I have concrete research interests and would be doing a PhD for the right reasons. I've also been told that my application would be strong for some good schools, so I feel I'd waste a valuable opportunity.

How do you decide to do a PhD, knowing that it's the "poor" route to take for the next 4 to 6 years of your life? It feels like a reckless move, but at the same time, a dream worth pursuing, and that nothing in industry could possibly come close to digging deeper into my research projects that I've started on.