They aren't. For the most part, everybody who ever would already does.

Entire states livelihoods basically depended on said conglomerate for some time, even if it was an honestly fairly shitty livelihood. Like... you know how Utah is basically a Mormon/religion state? Well, the O&G industry is just about an all encompassing religion for some other states. Decades of time, generations of families, and billions of corporate dollars went into brainwashing these people into thinking O&G could do no wrong and anybody who said otherwise was effectively trying to take their religion from them.

It is likely that nothing is going to change this any time soon. Psychology on a mass scale is insane. Just look at the Texas recycling campaigns.