Does improving animal rights now improve the far future?

80000 Hours says, “We think in­tense efforts to re­duce meat con­sump­tion could re­duce fac­tory farm­ing in the US by 10-90%. Through the spread of
more hu­mane at­ti­tudes, this would in­crease the ex­pected value of the fu­ture of hu­man­ity by 0.01-0.1%.”

I’m hav­ing trou­ble un­der­stand re­duc­ing cur­rent meat con­sump­tion would in­crease the ex­pected value of the fu­ture. I’m not en­tirely sure if by spread­ing hu­mane at­ti­tudes 80000 Hours if refer­ring to cur­rent hu­mans hav­ing more hu­mane at­ti­tudes or far-fu­ture hu­mans hav­ing more hu­mane at­ti­tudes. Also, when it says “hu­mane at­ti­tude”, I’m not sure if they ac­tu­ally mean chang­ing peo­ple’s ter­mi­nal val­ues to be more hu­mane or merely be­ing more hu­mane not by chang­ing their ter­mi­nal val­ues but by get­ting place higher value in in­creas­ing an­i­mal rights by bet­ter in­form­ing them about how bad they are.

If it’s refer­ring to mak­ing cur­rent hu­mans more hu­mane with­out chang­ing their ter­mi­nal val­ues, then it’s not clear to me how that would im­prove the far fu­ture. Peo­ple in the far fu­ture could pre­sum­ably have plenty of time to learn on their own what dam­age fac­tory farm­ing causes if for what­ever rea­son fac­tory farm­ing is still in use.

If it’s refer­ring to mak­ing cur­rent hu­mans more hu­mane by chang­ing their ter­mi­nal val­ues, then it’s not clear to me how this would oc­cur. My un­der­stand­ing is that an­i­mal rights ac­tivi­ties tend to spend their time show­ing peo­ple how bad con­di­tions are, and I see no mechanism by which this would change peo­ple’s ter­mi­nal val­ues. And if they do change peo­ples’ ter­mi­nal val­ues to be more hu­mane, and this is what peo­ple would like, then I don’t see why peo­ple in the far fu­ture wouldn’t just change their ter­mi­nal val­ues to be more hu­mane on their own.

I’ve look around on the In­ter­net for a while for an­swers to this ques­tion, but found none.