Ordinary people tend to care about privacy from government intrusion when you talk to them about it, and e2ee is so prevalent for lots of everyday communication that it isn't something they think about.

Discord recently introduced e2ee for voice chat. Apple has iMessage and Facetime. Whatsapp and to a lesser extent Signal are massively popular.

If you asked and ordinary person "Should the government be able to retroactively access your voice and written communications?" most people would probably react negatively.

Sure, in the pre-computer world, the US could possibly intercept letters and phone calls, but the complexity of that was high enough that it meant it could only happen with really strong cause and cost. With the barrier to scraping up unencrypted communications at near-zero (for governments and hyperscalers), the need for everyday citizens to have protected communications is higher.