Should they investigate libraries and coffee shops as well? How about the offices of businesses that offer VPN-based proxy services? Homes of those businesses' staff?
Absolutely. If a business is offering services that a customer is using to commit a crime, the police wouldn't be doing their jobs if they didn't go down and ask for logs.
You're conflating a raid with "asking for logs." If the police only asked the exit node operator if they had any logs there would hardly be any objection.