[I want the USA back]

There is no “increased” risk. What has increased is our perception of risk. The danger from asteroids was the same before these people did their study, as it is afterwards.
Don’t mistake perception for reality.

[BenLurkin]

The increased risk is created by the influence of Jupiter’s gravity upon the Taurid meteor showers.

[The Truth Will Make You Free]

Yes, for actual risk to increase the earth would have to expand, switch orbits, have stronger gravity, or the number of asteroids would have to mysteriously increase. Of course all these violate various natural laws.

This is unlike allowing muslims into any country on earth, which does increase the risk of terrorist incidents.

[GreenHornet]

There is no “increased” risk. What has increased is our perception of risk.

In my opinion, the actual risk is the same as it's always been. As you've said, the perception of risk has changed. This could be because technology has provided us with an increased ability to identify objects in space that could pose a potential risk to us. In years past, the risk was there, we were just oblivious to it because we didn't have the ability to detect it.