A typical class D exchange with IFR inbound goes something like this:
ATC: "traffic information is [a nuisance something being presented in a bored tone of voice like a thousand times previously requiring nothing further than acknowledgement]"
Pilot: "[disinterested because ATC won't let anything happen to us, we're IFR, right!] got it on TCAS [with tacit assurance to ATC that they're not going to hit it]"
Risky-shift and everyone is happy until it doesn't work.