There are multiple reasons why sliding door handles can get broken.

1. Excessive force: Sliding door handles can easily get broken when too much force is used when opening or closing the door. 

2. Poor installation: If the handle is installed incorrectly, it can easily break when the door is opened or closed. 

3. Worn out parts: Over time, the parts of the handle can wear and tear, making them more susceptible to breakage. 

4. Rust: Rust can weaken the metal components of the sliding door handle, making it more likely to break. 

5. Poor quality: Low–quality handles may not be able to withstand the weight and pressure of a sliding door, causing them to break.