Yes, you should block apps that you don't want to see. They are (per your reasonable definition) badly behaved, and you should exclude them from your stream. I think that's exactly the behaviour that FB would want, because it ties the utility/economics of those apps to the quality of their user-experience.
(Disclosure: I start at FB next week, though I don't have any inside info on this.)
Can you give me an example? Sites get entered in there if they try to install malware on people's machines. I think it's straight-up ridiculous to say that FB's text there is an attempt to mislead users. It gives good advice that most people don't keep in mind at a funnel point that's known to be relevant to an enormous number of phishing and other attacks.
Do you actually believe the things you're saying? I'm struggling here.
(Disclosure: I start at FB next week, though I don't have any inside info on this.)