the scientists started getting calls from people threatening their lives

[GoodTaste]

Could you see the logic relation between "the scientists started getting calls from people threatening their lives" and "(the scientists have found) that the drugs didn’t work"? Is the relation clear in English?

These mobs (the people threatening the scientists' lives and their families) seem to be the ones who believe the drugs are the cures for COVID-19 disease.

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There has also been research on possible vaccines, and clinical trials in the city of Manaus in the Amazon region on the effect of chloroquine and hydroxycholoroquine on people with COVID-19. But the researchers involved in these trials have had serious problems because of negative results. Because the trial results indicated that the drugs didn’t work, the scientists started getting calls from people threatening their lives and their families. That shows the situation we have here. The Brazilian Academy of Sciences has called for the government to stand by these scientists and protect them.

Source: Nature
https://www.nature.com/articles/d41586-020-01506-2

 

[GoesStation]

Could you see the logic relation between "the scientists started getting calls from people threatening their lives" and "(the scientists have found) that the drugs didn’t work"? Is the relation clear in English?

<SNIP>

Because the trial results indicated that the drugs didn’t work, the scientists started getting calls from people threatening their lives and their families.

Because this didn't happen, this other thing did. It's a common construction that can't be misinterpreted.