Ask HN: How surface-to-air missile can be fired unintentionally not deliberately

https://www.sbs.com.au/news/footage-of-mid-air-explosion-surfaces-as-canada-australia-say-iran-may-have-unintentionally-shot-plane-down

> Canadian leader Justin Trudeau says evidence indicates the strike "may have been unintentional."

> "We have had similar intelligence as our partners have," Mr Morrison told 2GB radio on Friday. "This is not a deliberate attack ... it's a terrible accident."