The reality is that fossil fuel is still necessary, choosing to not work in the oil industry doesn't change that. If suddenly no people chose to work in the business under some belief that it would be morally wrong, then what would happen? Wide spread energy crises, affecting everything from heating to transportation/travel and all production chains.

I don't think anyone except the most hardcore climate activists would be willing to accept that cost, so I don't think it's consistent for anyone except these to judge negatively people who choose to work in this industry. This doesn't change that we as consumers should try and use as little fuel as possible, opt for renewables where possible etc., that's the only way to guide the change. If we do that, the market will take care of the rest as the conditions allow it.