Nazism was quite centralized and therefore easier to target and eliminate. The bureaucratic structure made it easy to find and convict the main players afterwards. The ideology wasn’t totally eliminated, but new laws and such helped tamp it down.

The taliban is much less centralized and on top of that the various governments involved don’t have a lot of incentive to fall into line like Germany (which the US came in and rebuilt with a ton of strings attached so that it wouldn’t lose its German market share).