What reason does Buddhism have to say that Buddha himself was killed by a car at home?

Buddhism says: all the results in this life are the karma of the seeds sprouting and fruiting in previous lives (previous lives or N generations).

In this life, you worship Buddha, and the seeds of worship have been planted and will sprout, blossom and bear fruit in the future.

Everything in the world has a cause and effect. The law of causality is the first law of the universe. Physics, chemistry and any science are based on the law of cause and effect. For example, 1+ 1=2 is cause and effect. For example, when water boils to 100, it boils and vaporizes. For example, in plateau areas, water will boil and vaporize when heated to 80℃. It's all cause and effect. There is no such thing as cause and effect.

PS: Bankruptcy superstition-Buddha statue is not a shield. I made it myself, and I suffered it myself. It's good to worship Buddha, but it's not for this. You have to understand.

According to the laws of the world, do a good job in the aftermath. Don't be too sad. It has already become a result. I'm sorry for your loss. Just pay attention to safety and live well.