The subject of Soft target attacks is a political football, the left disputes what the right says, and vice versa.
That means nothing will be done. It's up to you to either step up and protect yourself and family, or be very lucky.
It's extremely difficult to protect against soft target attacks. That's why they're called soft targets. It's almost impossible for law enforcement to be 100%. You can't protect against someone with a back pack bomb, that positions themselves among fifty people waiting to enter an arena.
A few years ago I held an FFL license, meaning I sold firearms for a living. We had ATF agents, and State SWAT guys always in the facility. Many predicted exactly what is happening now. That we will be be on the receiving end of soft target attacks by terrorist organizations in the near future, and there is little or nothing to be done about it. Short of profiling. Because the terrorist take advantage of our own constitution and laws, and the law makers will forever be debating and posturing on the subject.