I have often send this kind of messages, explaining the 1 person rule, no guests, no parties, decent hours to be a bit more quiet etc etc. Still, some people stay with more people than agreed. This is not okay, but the worst guest are way more disrespectful. Somehow guests that are ok, yet you have a debate (for instance, they forgot to cancel a reservation and who should pay, which is a normal debate between host and (potential) guest). In cases like that, AIRBNB takes more often sides with hosts.
In my experience, the worst guests are not blocked by AIRBNB. Often they are new guests with limited reviews. I had 2x a really terrible guest: including aggressive behaviour against me, hard drug usage, stay many days after the booking ended while I was on holidays, shared keys with total strangers who hadnot booked, damages, leaving front door open in winter, stayed with more guests than booked etc etc. And in these 2 instances, AIRBNB just didnot do a thing not even afterwards. It was clearly borderline criminal behaviour (beyond bad guest) and AIRBNB just "lost" my e-mails about it, ignoring it, than stating it was too long ago (after first ignoring my immediate next day e-mails!!). The problem is, when you refuse a guest the day of arrival, AIRBNB sometimes charges you for it (penalty). So you are pushed very much towards accepting a guest even with bad feelings about them. And when they are indeed terrible guests, AIRBNB does not chose your side nor do they share contact info.
It seems AIRBNB lets guest pay for a dispute, if the guest is a decent person making mistake (damage or reservation mistake). And the 2x I had guests who were just terrible thugs borderline criminal, they get away with anything and AIRBNB blocks your messages at the contact center (!), ending the dispute without doing a thing. So beware, the screening of AIRBNB is not good. The 2x really bad guests I had, both didnot even look much like their ID, which AIRBNB does not seem to mind.
My advice. Do the full ID check yourself beforehand, as afterwards you cant count on AIRBNB to help you. As guests pay through AIRBNB, it is difficult to find them afterwards. The worst guests use fake IDs. And AIRBNB will not even send you their contact information, so you cannot contact the terrible guests yourself afterwards.