No subject

1. It looks like spam (harming our reputation)
2. It raises questions due to Jimmy Wales connections to the group
(harming our reputation)
3. It looks symptomatic of malware (harming the user experience)
4. The community wasn't consulted (harming community relations with
the Foundation)

I take no position on any of those (especially as I have not seen the
banner) save to say they do not seem "irrational" arguments as you
suggest.