But I guess the scammer have a bot running

Probably. Probably the whole scamming thing is automated, and the scammer just sit back, and watch the "show". I do not even want to know how much money the scammer received from the scammed accounts. This is very disgusting. The owners/runners of the scam websites should be in jail/prison.

If people don't know how to behave on the internet, should they then be allowed in the internet??

Scammers should not. Just like criminals should not be allowed on the streets (they should be in jail/prison), yet they are still on the streets. Actually scamming is also a crime, so this is obvious.

If you mean the victims of the scams, then people should be much more careful. They should be educated. Educating could also be applied to the scammers (even in jail/prison) to try to nudge them into the right way. There are some previously black hat hackers, who became white hat hackers (for example Kevin David Mitnick), so there is hope.