Security is about two things, mainly. It's about training and about awareness. I mentioned earlier that many people agree to some confidentiality and haven't read the agreement.
To answer your question, yes, you can definitely improve your security. Now, is it 100% foolproof? I can compare it to driving a car. Putting on your seatbelt and having your ABS brakes and all those security systems enabled will probably prevent your getting hurt, if you get into an accident. But do you still have a chance of having an accident? You still do, yes.