If a website says "Do this" and you're the person who follows random websites against security practices, because you believe in authority, a password manager does not help. You will open the password manager, search for GOOD.com and put it into BAD.com and be angry that your password manager can't do that for you.

"Any human can be tricked, no matter how smart they are."

and

"A password manager will protect me from doing the latter."

Don't work together. Either everyone can be tricked or not.

It says "Everyone can be tricked" but I can't be tricked because I use a password manager.

> you're the person who follows random websites against security practices, because you believe in authority

There are many reasons why such lapses of judgements happen, even to people who don’t believe in authority. For example, the fact that any human can be tricked.

> Don't work together. Either everyone can be tricked or not.

The password manager protects me from filling my password into the wrong site.

The password manager will not protect me from BAD.com tricking me into handing them out a one-time code that GOOD.com sent me via email.