What is destructive action?
Something that is destructive causes or is capable of causing great damage, harm, or injury. adj.
What is a destructive button?
A destructive button signals by its appearance that the user should carefully consider whether to tap or click the button.
Can there be 2 primary buttons?
Don't have more than one primary action button on the screen at a time. Let users focus on the task at hand. You can have more actions on the page, but make sure there is only one primary. Users have expectations of what a single button on a page will do, based on the page they are on.