I am sorry about what happened to you when you were young, but just because this was triggering for you does not mean that many other people should go without (what is now very rare) our alien abductions.
Without getting into the whole 'are sims giving consent or is it the player' conversation again (see the babysit thread), in my opinion, it is up to the individual to research a game or pack before purchase to ensure that the content of that game or pack is suitable for them.
If you look on EA's own site at the launch information for Get To Work, they have a picture of a sim in the process of being abducted by an alien, they mention the satellite dish and state that it decreases chances of abduction: therefore this gives the prospective buyer the knowledge that alien abductions occur:
https://ea.com/games/the-sims/the-sims-4/news/get-to-work-launch and if said buyer did not want alien abductions in their game then the opportunity was there not to buy the pack.
Many people may have purchased the pack with the excitement that they would be able to have alien abductions as part of their play. It is unfair to take away something they paid money for, something that was mentioned when the pack was launched. And this is happening far too often already.
