Now, you should resist, yes, but most people don’t. It takes a very brave soul to resist and hope the Supreme Court will side with you. Civil disobedience generally also requires vast public support who would rally behind you. Practically everyone knows Rosa Parks, but polls have shown only about 60% of Americans have even heard of Snowden. Public support is a fraction of that.
Cisco’s executives would also end up being involved in some massive lawsuits if they shut down the company to take a stand. Lavabit, OTOH, was multiple orders of magnitude smaller than Cisco is, and they could afford the backlash. It also didn’t help that Lavabit catered to tech people who would understand why they shut down. Cisco, OTOH, is used by virtually every large business; many of the employees of which would not understand why they shut down.
The NSA isn’t really in charge of the killing part anyway, that’s the CIA/FBI’s job
That's Cisco's own fault given that there are rarely more than 6 months between critical firmware releases that either have some way of hardcoded backdoor account, remote code execution or other similar bugs.