In one interview, he was asked why this was the case. He said he would actually much prefer to go do Liberal interviewers but the reality is that Liberal shows refuse to touch him. It usually happens with anyone who even remotely questions PC culture since they are afraid the SJW types will get triggered and boycott the show.

The times he has done some left leaning interviews, he is either just attacked (the Channel 4 News interview is a great example) or he is edited out to sound like an asshole - the Vice interview come to mind, in this regard. Don't believe me? Youtube the interviews, you will find the full and the butchered versions to compare yourself.

He has done some good ones in Europe, where people are a little more mature about interviewing people they might not even or necessarily agree with.

Peterson has some weird views I disagree with, when it comes to conservatism and religion but his science is on point with mainstream academia. People either do not know or just don't like hearing it because of cognative dissonance.