Ok, so your proof that they aren't going after Trump is the word of someone that might be less than trustworthy. Then they pick people that have ties to Clinton and some that were actually involved in plotting against Trump.
It's like asking a police officer to investigate themselves for excessive force. They know best about the crime, but probably aren't going to do a good job in carrying out justice.
I don't have proof they are going after Trump, but it is a better assumption that they are than believing people that have worked for the other side, and could possibly face charges for what they did, and surrounding themselves with biased people some of whom worked against Trump in the election.
If you think Mueller, Rosenstien or McCabe are going to actually work with the president to investigate this properly and make sure justice is served, you are deluded. Mueller is not our guy and none of these people have given us any really reason to believe they are pro Trump.