The terrorists moral shortcomings are even more reasons to negotiate with them and try to win them over
You're not negotiating with the terrorists (Meta), you're engaging with the public to explain why the terrorists are bad and why they shouldn't buy what's being sold.
The argument is that we aren't going to win this with sheer numbers or funding, so we need to slowly get people to understand why they are better off picking Mastodon/Fediverse over threads. Every instagram user is already being tossed into Threads, and you can't bring those people over if they never see posts or content from the Fediverse