Companies like Hertz don't have that much power, of course, and this week's measures are aimed only at the NRA, which, with its increasingly unhinged platform, is doing much to isolate itself from the mainstream.
Enterprise - the parent company of car-rental brands Enterprise, Alamo and National - cut ties on Thursday, when it discontinued an arrangement that offered discounts to NRA members. It was responding to a tweet saying "Please END your relationship with the @NRA".
"At Juniper, we had the chance to get the NRA affinity relationship, and we passed", Vague said.
Symantec, which makes the Norton anti-virus software and owns the identity theft protection company LifeLock, said Friday that it is severing ties with the NRA. "We will be requesting that the NRA remove our information from its website". "The "valuable 5-star benefits" promised include ... savings on insurance, identity theft protection, hearing aids, vehicle rentals, moving vans, shipping, and even wine", she writes.
Enterprise Holdings, which owns three auto rental brands, confirmed on Twitter that it is ending its discount offered to NRA members.
And the list went on.
Before Thursday, then, the First National Bank of Omaha was one of roughly two-dozen corporations to offer exclusive incentives to NRA members.
Company spokespeople reached by NPR would not elaborate on the announcements.
The NRA has not commented on the boycott movement.
The swiftness of the corporate reaction against the NRA has differed from that of past shootings, including the 2012 Sandy Hook Elementary School massacre that claimed 26 lives and the killing of 58 people in Las Vegas last fall, said Bob Spitzer, a political scientist at SUNY Cortland and a scholar on gun politics.
"The last time he showed support for sensible gun reform - no fly, no buy - he quickly dropped his support once the NRA opposed it".
Gun-control organizations Moms Demand Action and Everytown sent a letter Friday asking five companies - Google, Amazon, Apple, AT&T and Roku - to cease streaming NRATV, saying "it's time for tech leaders to acknowledge their role in helping the NRA spread this unsafe content". Rather than just following the standard post-mass shooting script, Parkland students are firing back at right-wing conspiracy theorists and forcing ineffectual, NRA-sympathetic senators like Marco Rubio into an embarrassing defensive crouch.
Credit the activists who have decided enough is enough and taken to social media to tell companies that have worked out deals and discounts with the uncompromising gun lobby that they will boycott them if their professional relationships continue. "As usual, the opportunists wasted not one second to exploit tragedy for political gain", he said.
Trump has been proposing a growing list of ideas, including more stringent background checks for gun buyers, reopening some mental institutions to hold potential killers and banning "bump stock" devices that allow semi-automatic rifles to mimic machine guns.