Recently, I found myself in a similar situation, where I needed to delete all mature games and wasn't sure how to go about it. Anyway, after searching for a bit, I stumbled across Mame Content Manager Plus, which worked perfectly. Yeah, it is old software, but if you get a new catver.ini file you should be fine, plus it still works.
While I was deleting the mature games, I also went ahead and got rid of the casino and gambling games, and, again, it worked perfectly. The only thing I'd caution you about is to not get too overzealous, as you might end up deleting needed BIOS files (resulting in the games dependent on said BIOS to not work - that happened to me with the Neo Geo bios).
You can get Mame Content Manager Plus here: https://www.mcm.mameworld.info/
Hope that helps!
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