Tragic events close to us can be upsetting. Rationally, you're risk riding to work is exactly the same yesterday and today, as it was the day before yesterday.
Nothing's changed. Riding a bike is potentially dangerous. Statistically however, that danger is a pretty low risk, and more than offset by the health benefits.
So don't wig out because you hear of an accident.
How many motorists died yesterday commuting to work? Yet we still drive.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.