You're right, but I think the mentality around marijuana legality is colored by the fact that marijuana remains illegal federally, marijuana legality is so new in many places, and marijuana isn't fully unrestricted even when "legalized". This page has a bunch of tables regarding the legality of recreational marijuana in Michigan: https://www.clickondetroit.com/news/michigan/2022/05/19/a-gu...
So while I don't think they should have done what they did, I'm not shocked that cops walked into a building full of marijuana plants and thought "we have to bust these guys". I think if marijuana became completely legal and unrestricted nationwide, cops would probably get it - "welp, I guess this is legal now".
Civil asset forfeiture is just theft, and the police who engage in this behavior are happy to steal from all sorts of people engaged in all sorts of perfectly legal activities. It has literally nothing to do with marijuana.
