It is known that the Proxima Centauri star system is merely $\approx 4.25$ light years away from Earth. Moreover, an Earth-like planet has been discovered around Proxima B that is within the habitable zone. Given that there is such a short distance for potentially establishing communication with a hypothetical civilization, why is it that:
There have been no serious attempts at sending signals to that system - even if there is a very slim chance of receiving a response, surely the fact that there might be one in only $\approx 9.5$ years is a scientifically motivating one?
I understand that some people, like Hawkings, argue that contact with such civilizations should be avoided. Still, I see no significant debates about sending a signal to Proxima. Surely, there would be a number of scientists who support the idea to initiate a debate on the subject?
So, what gives?