"In the end, I ask people, because I keep hearing this question of why, 'What would be the answer that would be an acceptable answer for you?' They have to think about it for a moment, and they say, 'Probably nothing.'
"I have to say, 'You are probably correct.' I can't imagine what the answer would be that would let us go, 'OK, we understand now.' Because we are not going to understand."
Authorities allege that Dalton shot the first victim outside an apartment complex and that he shot seven other people over the next several hours.
Police have not provided a motive. The victims had no apparent connection to the gunman or to each other.
The attacks began Saturday evening outside The Meadows, an apartment complex on the eastern edge of Kalamazoo County, where a woman was shot multiple times.
A little more than four hours later and 15 miles away, a father and his 17-year-old son were fatally shot while looking at cars at a car dealership.
Fifteen minutes after that, five people were gunned down in the parking lot of a Cracker Barrel restaurant. Four of them died.
A spokeswoman for Uber confirmed that Dalton was a driver for the company, but she declined to say whether he was driving Saturday night.
Uber prohibits both passengers and drivers from possessing guns of any kind in a vehicle. Anyone found to be in violation of the policy may be prohibited from using or driving for the service.
Many handguns and long guns were seized from Dalton's home. But there was no indication that he was prohibited from owning the weapons, said Donald Dawkins, a Detroit-based spokesman for the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives, which was assisting police.
Gary Pardo Jr., whose parents live across the street from Dalton in Kalamazoo Township, described him as a family man who seemed fixated on cars and often worked on them.
"He would go a month without mowing his lawn but was very meticulous with his cars," Pardo said, explaining that Dalton, at times, owned a Chevrolet Camaro and two Hummer SUVs.
Progressive Insurance confirmed that Dalton once worked for the company before leaving in 2011.
Dalton was an insurance adjuster who did auto-body estimates and once taught an auto-body repair class at an area community college, said James Block, who has lived next door to him for 17 years.
"He loved to do things outside with his kids" like taking them for rides on his lawn tractor, Block said.
The Associated Press