* Eich was ousted from a full-time job. Thiel is not an employee of YC.
* Eich's beliefs were well within the mainstream; Barack Obama campaigned in opposition to marriage equality.
* Eich's support for Prop 8 was quiet. It was mined out of a database and used against him. So far as I can see, he had not made any Mozilla employees uncomfortable. He didn't get on stage at the RNC and use his position at Mozilla to suggest that Silicon Valley opposed marriage equality.
* Eich's support for Prop 8 was relatively insignificant. In addition to being such an important Trump surrogate that his actions make the front page of CNN, Thiel donated millions and bundled millions more to the Trump campaign.
* For that matter, marriage equality is a substantially different issue than Trumpism. Trump believes Muslims, including US citizens, should be prevented from entering the US. He proposes a religious test for entry into the country. He believes his political opponents should be jailed. He is campaigning against the very legitimacy of the election he's running in. Trump is running against the very idea of equality of citizenship. You can't say all those things about the belief that LGBT people should be denied marriage rights --- in fact, you have pretty good evidence of the difference: thankfully, the cause of marriage equality crushed the cause of traditional marriage.
The campaign to oust Eich from his job at Mozilla was wrong. I didn't support it at the time and I don't support it now. I do not feel that way, even a little bit, about the call for Graham and Altman to live up to their own words about Trump.