DE2 push buttons question

I have also confirmed that although there is a debounce it is not good because it doesn't actually make use of a double throw switch. In other words the mechanical characteristic of this cheap switch allows contact-no contact to occur when it is being held depressed. This activity is similar to one methodically pressing and releasing the PB, giving multiple debounced responses. In other words, this kind of debounce can't solve the mechanical switch shortcoming.