How come mass shootings are getting deadlier?

For instance. The deadliest mass shooting in the 1960s killed 17 people
Deadliest mass shooting in 1970s: killed 13
Deadliest in the 1980s: 22
Deadliest in the 1990s: 24
Deadliest in the 2000s: 33
Deadliest in the 2010s: 59
Will a guy kill 100+ people in the 2020s?
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