I think there are three very different questions to consider here:
1) Should an employee be held accountable for his/her political beliefs. (Heck no.)
2) If someone with different political beliefs than I runs a company, will I boycott it? Ex - Owner of Whole Foods is against Universal Healthcare, so I'm boycotting, though I approve of him running the company. In such a case we support our ideologies through capitalism.
3) Should someone who runs a technology company - a multi-billion, multi-national that shapes our future and impacts our daily work lives & culture - should someone who actively holds and acts upon prejudice be allowed to run such a powerful company? No.
That third one is important - and somewhat scary - to consider. We've crossed a threshold. Large technology companies - and many startups - are literally creating the future. We are shaping the world in a way that goes way beyond the capacity of companies in decades past. There is a far greater responsibility to consider.