The Tories "fought" an election based on lies, personal attacks and dirty tricks. Setting up apparent independent websites and creating adverts that contained clear untrue statements (8 taken down by Google) it flaws the manner in which the election is run. Our resident smug Tories know this but see the ends as justifying the means.
I don't think Johnson needed any help. He has the media on his side and opponents in Corbyn and McDonnell who played a blinder in his victory. The opposition were so poor that any old lying, racist, philanderer could have won.
I have a large number of relatives in Blyth which has just gone Tory. They all reckon the Tory got in as a result of Brexit and Corbyn and was the beneficiary of a protest vote. How many seats were won similarly is anyone's guess but time will tell.