in perpetuity for centuries now in a fiscally responsible way.

Allowing the private sector to invest in future economic growth in exchange for future interest payments is in no way fiscally irresponsible. In fact, that's way more responsible than seizing private sector assets under the threat of force, which is what taxation is.

But if the government uses those funds for things that don't promote economic growth - for example, entitlement payments, bloat, $150,000 hammers, etc - it doesn't matter where they recapture that money from (debt or taxes), it's not responsible. If they use those funds for things that do promote growth - for example, infrastructure, innovation, national security, etc. - it doesn't matter where they recapture that money from (debt or taxes), it's pretty responsible.