Sri-Lanka's policy certainly was a disaster. Not sure you could classify that as a "liberal" policy. And, do you know of any liberals in the US in position of authority pushing for strict organic farming ANYWHERE?
Open southern border? Apprehensions are up 336% over the past 12 months compared to trump's last year in office.
Defund the police? Where in the USa is this being instituted specifically AND please show how (if it has) it has "failed". Also point to any influential members or leaders of the democratic party pushing for this as a national policy. Of course, you know Biden doesn't support this and has not ever advocated for it.
Masking children? It's a stretch to call this not only a "liberal" policy, but a failed one. Of course you are viewing this with hindsight bias. Maybe no one really liked this strategy but it is difficult to say (at best) how effective or ineffective it was.
Prop 47? Maybe. I certainly don't fault a state for making an attempt at criminal prevention reform, especially a state stressed by budgetary constraints. Not throwing folks in jail or prison for minor drug possession I think is the right call. The petty property crime and stealing has not seen success and is incredibly irritating. I used to catch shoplifters in the Seattle area in the late 80's and at that time Washington State law had a threshold of $1500 and above for felony theft (grand larceny). It seems California set that mark at $950 and up. I would say in this case - yes - this is a liberal policy that in the lower crime end has - if not failed - has NOT succeeded. As for more violent crime, it did not lead to an increase there as per this study:
https://www.ppic.org/publication/the-impact-of-proposition-47-on-crime-and-recidivism/ Also, you don't see other "liberal" cities or states rushing out to duplicate this policy, meaning it was specific to one state trying to cope with specific issues unique to that one state.
Ballot drop boxes? What's the problem? Washington State and Oregon have used these for years and years. Utah does too. If by problem you mean limiting the Texas county which is home to Houston to one drop box serving over 4 million people, I agree. Do you have evidence of ballot drop boxes being stolen or broken into on a regular basis?
Eliminating voter ID? Who is doing this and where is this happening? Most jurisdictions don't even have that as a requirement and any ones that do - again, who are the liberal politicians calling for rescinding this requirement or removing it? If you have examples, I'm open.
Not promoting nuclear energy in the US? Which influential and policy driving liberal leaders are against this? Better yet, which influencial and powerful policy makers in the GOP ARE advocating this? And how are they promoting it? Did trump or the Republican congress when they were in power push this agenda at all in ANY significant way? The answer is NO. The reason is because it is expensive. As a nation I guess we don't have the stomach for it. True, the radical environmentalist are definitely against nuclear. I do not believe your typical liberal is against it. I'm not. The private sector will not take up contracting nuclear because of the cost and our existing fossil fuel industry is already established and is cheap by comparison.
I do not think it is fair to point to Sri-Lanka's failed farming policy (instituted as a nationalistic, protection policy I believe) as evidence of "green" ideas failing in any way remotely connected to anything proposed (and not yet enacted) in the USa. Taihtsat