> We don’t need precise definitions or scientific rigor to know things.
You "know" because of empathy. You're a human, you're conscious, therefore other humans are probably conscious too. The truth is for all you know they could be soulless golems, you just choose to believe otherwise. It's a spiritual belief.
Only consciousness I'm sure of is my own. Everyone else, it's a leap of faith. I have no trouble extending that leap to cover AIs.