Because "they" all think that Russia will ALWAYS be tipping the scales in their direction so they do not care.
IMO this is the real heart of the matter when it comes to Trump, his campaign and people in "his orbit" when it comes to "Russia helping" Don did not see it any different than John Gotti "helping him out with the unions" or some "mobbed up" supplier when he was building Trump Tower or some other project in NYC way back when when he did actually build or "renovate" buildings. I am sure his "attitude" was "well he was/is just trying to help me, what am I supposed to do say no ??"
IMO this is the real heart of the matter when it comes to Trump, his campaign and people in "his orbit" when it comes to "Russia helping" Don did not see it any different than John Gotti "helping him out with the unions" or some "mobbed up" supplier when he was building Trump Tower or some other project in NYC way back when when he did actually build or "renovate" buildings. I am sure his "attitude" was "well he was/is just trying to help me, what am I supposed to do say no ??"