Shortly after the news broke that gunmen had opened fire on a center for people with developmental disabilities in San Bernardino, Calif., public officials began to extend thoughts and prayers to the victims, offering sympathy and expressing disbelief. Many of them did it online. And at least one person was entirely unimpressed.

Igor Volsky, who is the director of video and an editor at the left-leaning media outlet Think Progress, seized the opportunity, first by criticizing politicians for not supporting stricter gun legislation and instead offering only words of support, then by calling politicians out by responding to their sympathetic tweets with details about the money their campaigns have received from the NRA. 

In one tweet, Volsky attacked Republican presidential candidate Rand Paul for his gun policy.

In another, he singled out representative Tom Rice for offering words instead of action.

In yet another he responded to a tweet by the press office of Senate Majority Leader Mitch McConnell that says "The senseless loss of innocent life in defies explanation. Our thoughts are w/ the victims & their families," pointing to the nearly $1 million the NRA spent on McConnell's 2014 re-election bid.

There are dozens more.  The Tweetstorm, which lasted several hours and runs nearly 100 tweets and responses long, can be read in full below. And it spares no one. Volsky calls out virtually every right-leaning senator, topping their messages with the amount of money they have received from the NRA. He also reminds of the vast dollar amount of NRA contributions altogether: "$30,650,008 in independent expenditures during the 2014 election cycle."

The stream of responses gets right to the heart of liberal outrage over the increasingly contentious partisan disputes about gun laws, and, most poignantly, the sincerity of NRA-backed politicians. The tweets express a sense that lawmakers who aggressively defend  gun rights  are quick to offer words but not action.

None of this is to say that there is anything wrong with extending condolences to the victims of tragedies, such as Wednesday's. A lawmaker can sincerely offer sympathy to those affected by the shootings while still believing in very limited restrictions on the ownership of firearms.

But for those who view guns as a significant contributor to mass shootings, it's hard to see politicians offering thoughts and prayers without feeling a little miffed.