How do you get rid of the hostile programs? If one could get rid of the hostile people, we wouldn't need passwords. Login is enough. Much easier to develop web

How do you get rid of the hostile programs? If one could get rid of the hostile people, we wouldn't need passwords. Login is enough. Much easier to develop webapps. But we can't get rid of the hostile people and we can't get rid of the hostile programs. The only semi-successful way to get rid of the hostile programs is Apple-style walled garden. But even there malware happened. And giving up all your freedom for that kind of safety is like going to the jail voluntarily to be safe from the outer world. I don't think that this approach would work for everyone.