It’s completely fair to reject anything they propose until it is clearly shown not to be bad. It is also fair not to examine everything in great detail and assume it will be bad until shown otherwise, because the track record is so strong.
It doesn’t mean being unwilling to listen to evidence, but it does mean not being willing to put in the effort to check it over without a strong reason to think that it might actually be different this time. Because they can and will put out a torrential deluge of crap just to exhaust people’s ability to critically analyze all of it.
If someone works for you and does things in your name, you are responsible for those things and they can be fairly attributed to you.