For discussion purposes, here are the 22 tags removed over the course of the past two weeks, in the form of links to a Google-cached copy:

http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/forum
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/aao
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/chicken
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/fakes
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/harassment
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/truncated
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/shared-network
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/shared-devices
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/guest-posting
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/move-to-chat
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/svg
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/impact
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/stackpromos
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/robotics
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/delete
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/respect
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/robo-review
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/youtube-channel
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/junk
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/sarcasm
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/recruiting
http://webcache.googleusercontent.com/search?q=cache:https://meta.stackexchange.com/questions/tagged/meta-feature-request

Caches will not exist for all cases. But for those that do exist, we can conduct an informed discussion as to whether this vigilante action is serving our needs or working against them. 

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Update: I've taken a quick pass on these and restored portions of: [tag:forums], [tag:chicken] and [tag:sarcasm]. Not naming any names, but... Some of the folks involved here were a lot better than others about *replacing* tags with other, roughly-equivalent tags.