When someone attempts to force the door, the screws can easily tear away from the frame. It does not require a degree in engineering to know that this is not effective protection. Your family will not be protected by a few inch screws. Sliding patio doors are often the point of entry when a burglary or Home Invasion takes place. The reason is that the lock on a sliding door is flimsy and easily broken and it is also quite easy to lift the door out of the track.
Many people use a simple wooden dowel or iron bar to prevent the door from opening.
These, however, can be lifted and removed from the outside with a simple tool, through the crack between the closed doors and they do not prevent the door from being lifted out. 288,000 is a large number but there are many millions of doors in the USA and it is reasonable to assume that you will never become a victim. While you may never have an attempt at a home invasion at your house, you will have callers that knock on your door. That is when you will appreciate that you have these steel bars behind your door so that you are in control. The Defendoor Security Bar for Patio Doors is a steel expansion bar that is the strongest on the market.