I donno. I just run my turns these days so it's hard to know how another leader would react but ordinarily I only kill if someone asks me to or whatever, unless I'm getting hit. I assume if LaF wanted to kill them, they'd probably not contact us and do the work themselves. So it's super hypothetical, but usually I probably would not engage with an ally killing a suicider one day before an arranged war I guess.

It's not even like the whole tag was hitting you it was a just a lone wolf suicider, I think most tags handle that internally.