In recent weeks, protests have spread across America in response to multiple grand juries declining to indict police officers responsible for the deaths of unarmed black men. Those decisions have led to an outpouring of grief, anger and anxiety over a criminal justice system that seems to operate with little accountability, especially where the deaths of people of color are concerned.

It's not clear exactly why grand juries rarely choose to indict police officers involved in the deaths of unarmed black men. But we do hear the excuses made on their behalf.

Here are some of the explanations and justifications we've been offered:

1. Health complications.

Eric Garner's July 17 death at the hands of NYPD Officer Daniel Pantaleo was captured on film and circulated on the Internet. Garner's last words, "I can't breathe," later became a rallying cry during demonstrations made in his name. Pantaleo, who placed Garner in a chokehold prohibited by the police department, was not indicted for the death. Rep. Peter King (R-N.Y.) said shortly after the grand jury's decision that Garner would have survived the fatal chokehold had he not been "obese."

2. Standing in a stairwell.

Akai Gurley, 28, was fatally shot by NYPD Officer Peter Liang in the Louis Pink housing projects in Brooklyn last month. New York City Police Commissioner William Bratton defended the shooting as an "accidental discharge" in a "dark" stairwell by a cop who had been on the force less than 18 months.

3. Resembling someone's idea of a "thug."

In August, 18-year-old Michael Brown was fatally shot in Ferguson, Missouri, by Officer Darren Wilson following a daytime altercation in the street. During a recent segment on NewsMaxTV, former Arkansas Gov. Mike Huckabee insisted that Brown would still be alive "if he behaved like something other than a thug," an apparent reference to disputed witness testimony that Brown was reaching for Wilson's gun before he was shot. (Most of the witnesses who testified before the grand jury said that Brown had his hands raised when he was killed.)

4. Wearing a sweatshirt.

Trayvon Martin, an unarmed Florida teen whose death in February 2012 led to protests across America, was blamed for his own death for wearing a hooded sweatshirt. Trayvon, 17, was gunned down by George Zimmerman, a self-appointed neighborhood watch volunteer. Shortly after Trayvon was killed, Fox News host Geraldo Rivera said, "I think the hoodie is as much responsible for Trayvon Martin’s death as George Zimmerman was." (Zimmerman, it should be noted, was a civilian neighborhood watch officer, not a policeman.)

5. Being the child of someone with a troubled past.

Tamir Rice, 12, was gunned down by Cleveland police while holding a toy gun at a public park last month. The Northeast Ohio Media Group then ran a story about Tamir's father, Leonard Warner, and Warner's history of domestic violence -- because, author Brandon Blackwell explained, "people from across the region have been asking whether Rice grew up around violence."

Warner was not present when Tamir was killed. Blackwell's story on Warner offered no background information on Officer Timothy Loehmann, who was deemed unfit for policing two years before he shot Tamir.

6. Taking your medication.

A Phoenix police officer fatally shot 34-year-old Rumain Brisbon earlier this month after mistaking a pill bottle in Brisbon's pocket for the handle of a gun.

7. Asking for help after being in a car accident.

Jonathan Ferrell, 24, was shot in Charlotte, North Carolina, in September after surviving a car accident. Ferrell crawled through a window of his car and began banging on the door of a nearby home to get attention. When officers arrived at the scene in response to the homeowner's report of an attempted break-in, they shot Ferrell 10 times as he approached them with empty hands.

8. (Possibly) dressing up as a character from a TV series.

This is what Hunt was wearing when he was killed. Compare to the character from Samurai Champloo. Was he cosplaying? pic.twitter.com/TlFS49OTYJ — Jamelle Bouie (@jbouie) September 15, 2014

Darrien Hunt, 22, was fatally shot in September when Utah officers responded to a call of someone walking around with a "samurai-type sword." Cops said that Hunt lunged at them with the toy sword, but witnesses claimed to have seen him running from the officers, and an independent autopsy showed that Hunt was shot in the back.

9. Complying with a police officer's command, immediately.

Levar Edward Jones was shot by South Carolina trooper Sean Groubert in September. As Jones stood next to the open door of his vehicle, Groubert asked him to retrieve his wallet. Jones reached into his car to do so. Groubert then demanded that Jones get out of the car, and opened fire as Jones complied. Jones asked: "Sir, why was I shot? All I did was reach for my license." Groubert responded: "Well, you dove headfirst back into your car."