You ask the question whether the Justice Dept should be investigating Intel instead of Microsoft. I say they should investigate both since both companies have clearly stunted the market in their respective fields. However, I do not feel that companies feel threatened by the Justice Dept any longer.
Justice can point to only a few successes in anti trust actions.
In the early 1980's, the threat of a Justice Dept investigation forced IBM to release the PC and allow all sorts of clones to come on the market. I will not comment on whether this was good or bad. My point is that IBM settled rather than fight the Justice Dept. I don't believe that companies today feel as threatened. Don't buy one.