Yeah, having buzzer systems and security gates alone is really giving a false sense of security.
A couple of weeks ago, a girlfriend of mine was visiting for the weekend...she's thinking of moving here, so we were casually looking around to see where she'd like to rent an apartment for the first year, while house hunting.
Funny, owning a house I hadn't paid that much attention to apartments in the last few years.
I noted that all the newer ones here had electronic security gates, that would only open for cars with the pass key, card, code whatever.
I asked my friend if that made her feel any safer (I know she lived in such a place when we first met)
She said - Oh no, if people want to get in, they'll figure out a way. It's not that hard. Also, the friends of residents that are let in by them could very well be a danger themselves.
Wow - I then remembered that a couple years ago a woman was shot in her security gate apartment by someone that was friends of another resident.
Well, that part can't be solved, unless you force a resident to keep their friends with them at all times
However, I see the best solution is having an actual human being manning the gate, security, a concierge, what have you. They can keep out strangers, and there would also be a record of who comes and goes.
Yes, this would be an added expense, but if one wanted security, one must pay.