查看了原文作者附上的英文消息，清楚表明死因尚在调查之中，没有自杀的结论。也没有遗书。但原文作者就急于下结论是自杀。为什么？

查看了原文作者附上的英文消息，清楚表明死因尚在调查之中，没有自杀的结论。也没有遗书。但原文作者就急于下结论是自杀。为什么？
The cause of death for Liu and his 17-year-old son William is still under investigation, as Mountain View police continue to investigate the noxious smell that broke out at 2025 California St. and triggered an evacuation Wednesday evening.
...
Tanaka confirmed that the noxious smell was not caused by a gas leak, and that no suicide note had been left at the apartment where the two bodies were located.