April has such a tragic, evil history of mass shootings....... and we still fail to keep guns out of the hands of the crazy and dangerous

Why do so many of these mass shootings - like Columbine, like Virginia Tech - occur in the month of April?  And why do we still make it too damned easy for crazy and dangerous people, and criminals, to buy unlimited guns, enormous firepower, from private sellers without a background check, and from gun shows under the gun show loophole?

Why? 

Why don't we learn from our mistakes regarding guns and the people who abuse them?
From MSNBC.com

Gunman kills 7 at small Calif. university

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By msnbc.com staff and news services Updated at 5:45 p.m. ET: A gunman opened fire Monday morning at a small Christian university in Oakland, Calif., killing seven people and wounding three, according to the City of Oakland. Earlier reports said five had been killed. "10 people were injured during this morning's shooting, 7 of which are fatalities," Cynthia Perkins, a public safety official, said in a statement. The Oakland Police Department said a possible suspect was in custody. "No imminent public safety threat appears to exist in immediate area," the department said on its twitter account.
Some of the wounded at Oikos University were taken away by ambulance, while others were cared for outside the building, the Oakland Tribune reported.
The school's director said the suspect had previously been a nursing student at Oikos but was no longer enrolled, the Tribune reported. He was unsure if the man had been expelled or dropped out.
Police had been looking for a gunman described as a Korean man in his 40s who allegedly carried out the attack on Oikos University, the San Francisco Chronicle reported. The man had a heavy build and was wearing khaki clothing, police said.

KNTV

A victim in the shootings at Oikos University in Oakland, Calif., is taken to an ambulance.

Angie Johnson told the San Francisco Chronicle that she saw a young woman leave the building with blood coming from her arm and crying: "I've been shot. I've been shot."
The injured woman said the shooter was a man in her nursing class who got up and shot one person at point-blank range in the chest before spraying the room with bullets, Johnson said.
"She said he looked crazy all the time," she said the victim told her, "but they never knew how far he would go."
Oikos says it aims to educate “emerging Christian leaders” and offers courses in theology, music, Asian medicine and nursing.