Abie's Choice

The TORAH makes the following point. Lot was a no-goodnik even though he was Avrohom's nephew. His flocks were allowed to roam and eat the growth of subsistence farmers.Upon being rebuked Lot innocently asked,"why the fuss?" After all this land is filled with heathens whom Avrohom will inherit and I an his only heir! Therefore all of their land really belongs to me and i have only stolen from myself!
Avrohom controlled his fury at the insensitivity of his relative. They parted ways amicably.
As soon as Lot was gone G-D speaks once more to Avrohom;"Look around you , this whole land
will be your children's forever!"
The Rabbis comment,why does it say that after Lot separated from Avrohom G-D spoke to Avrohom? In order to underscore that as long as Avrohom had the wicked Lot in his midst , the Divine presence would not be revealed to Avrohom. This was due to the fact that Lot's very presence disturbed Avrohom's happiness and concentration so that Avrohom could not attain prophecy as long as Lot was there!
The simple conclusion seems to be don't harbor any wicked relatives so that you will receive G-D's presence!
I disagree! For we are after all speaking about a choice made by Avrohom who was fully aware that he would not be a vessel for G-D's glory as long as Lot was around. Yet Avrohom chose to have Lot stay even though it meant no prophecy. Therefore one must conclude from Avrohom's choice that it is more important to influence another to moderate his behavior for good things
than to speak to G-D all day!