I'll make myself unpopular and give the argument why you needn't be extra-worried.
For a 30-year-old German, the chance that they die within this year is 0.0005, equating 1 death per 2,000.
Source on Wikipedia. For a given day, this means 1 death in 730,000 (= 2,000 * 365).
Munich has 1,300,000 inhabitants. The attack killed 9 people. If we don't know anything else, the change to having been killed is 0.000006, or 1 death per 150,000.
This shows how it is only 5 times as likely to have been shot here than it is to die on a chosen day by random cause -- usually a traffic accident for 30-year-olds. If you aren't worried about car crashes throughout the entire week, you needn't be worried about the shooting.
It doesn't matter how prominent it appears in the media. It appears in the media because there are few comparable events. Let's be happy about this rarity instead.
-- Simon