I would argue it is trust. I trust my password manager to validate the website I am entering my password into more than I trust my eyes. I know that I can't be

I would argue it is trust. I trust my password manager to validate the website I am entering my password into more than I trust my eyes. I know that I can't be perfectly vigilant every single time I enter my password. The risk of the password manager betraying me is roughly an order of magnitude below the risk of my falling for a phishing attack. Plus I use the password manager baked into my browser, so I'm basically trusting it anyways.