Enough of them had a basis in fact to get a founder fired.
You may even get owned for politically incorrect behavior that occurs in private and completely external to your professional affiliation. Off the top of my head I can cite a handful of such ousters that have occurred in the last month, including but not limited to Brendan Eich and Donald Sterling.
We're in a really bad spot right now. The principles that undergird free society are not well regarded anymore. Make a single statement that stirs the ire of the reigning corporate thought police and you're done for, no matter how innocuous it may or may not be. People don't care about the facts, it's all about perception, and if you're perceived as a thought criminal in any of the many varied channels now considered taboo, you're "toxic" to the company. It's as simple as that.
Considering this status, perhaps aggression and even subtlety are justified if you're seeking to defend yourself against the types of accusations that would get a toxic label applied to your name.
* The rules that say the government is not allowed to define marriage further than "two humans say they want to live together and want us to give them stuff for it" are very new, and Eich was fighting to not have this become the rule.
* Gay people should be perfectly comfortable working for people who supported Prop 8 or they're going to have a hard time, as there's a > 50% chance that a random stranger will have done so.
* Eich's ideas on what relationships the government should reward does not materially affect his performance as CEO. He'd already promised to keep Mozilla's inclusive policies.
* If you really want to say gay people would find it impossible to work for Eich, I find it hard to believe that any such persons at Mozilla are less replaceable than Brendan Eich. If they do resign in protest, Eich would've had no trouble replacing them. However, Mozilla's official statement indicated the vast majority of the company supported him, with "less than ten" current employees threatening resignation if Eich maintained his post.
* The board didn't fire or pressure Eich to leave. He resigned voluntarily as damage control. Mozilla's official statement is clear about this.
Casting anyone who supported Prop 8 as a villain is a wholly untenable philosophical stance. It condemns the majority of Californians and Americans. You can't live life with that large of a chip on your shoulder, it's completely disruptive. If you are doing so, I recommend you seek a shoulder-chip repair professional before further damage to self and others is perpetrated by political intolerance.
He wasn't brought down by a case that proved his practices were discriminatory. As far as I know no one has claimed that he was discriminatory in whatever hiring capacity he had with the Clippers (which for the record is probably not major). No one would know or care if the news media had something worthwhile to talk about instead of celebrity gossip. They can replay a sound bite over and over and turn a whole city against someone, someone who didn't do anything wrong other than possessing an opinion that's considered uncouth or presented as troublesome, and more than just "public outrage", they can then get his property taken against his will. The fact that this is possible, regardless of the content of the sound bite, should be very scary to anyone interested in maintaining free dialogue.
Free dialogue necessarily requires people to feel capable of expressing very unpopular things without major ramifications. Adverse governmental action is one element of this, but not the only element. I understand that the proceedings against Sterling are held in accordance with NBA bylaws to which Mr. Sterling supposedly agreed and that they're not an external legal proceeding (though I don't doubt there would be such a proceeding if the NBA didn't have provision to strip Sterling of ownership), but as stated, public hostility toward the principles of free speech, which is becoming quite massive, is nearly as problematic, especially when our media is so conglomerated.
Our modern communication media are inherently dangerous due to the extreme barrier to entry. This is changing partially with the internet, but for the time being and foreseeable future, it's still no competition with cable and establishment outlets. This is a major social and cultural threat and the FCC should do something about it.
Which allegations were true? What did that founder actually do? Did she expose herself to liability through libelous statements?
On this, The Court of Public Opinion lacks the standing to rule. Your comment is a case-in-point as to why.