I apologize for making a generalization, but whenever I see anyone of any political alignment suggesting that their issue of choice is being ignored/suppressed the mainstream media, the claim is almost invariably without merit.
Well, let's just take a closer look at Google News, shall we?
Google News has a handy feature: when you search for a topic, under the first result is an option to explore in depth, and it shows you the number of additional articles you'll find on said topic. There may be more besides, but let's take this as a reasonable proxy of media interest.
Let's assume that, for any given an event, the height of news coverage occurs the day after the event.
The march was on Oct. 10th, so we would expect "peak news" to be on Oct. 11th. I adjusted your search to focus only on Oct. 11th, and Google News's Explore in depth showed me there were 1,076 more articles about the topic. It's true: not altogether absent.
To the Ferguson riots. Wikipedia pins the start date on 8/9/14, so let's take peak news date as 8/10/14. (However, given this was a multi-day narrative, we know that news coverage did not end after 8/10/14, but continued.)
How many Explore In Depth articles does Google News tell me were available for search term Ferguson riots on 8/10/14? 13,445.
The evidence is overwhelming: the media is far more interested in the riot narrative than in the peaceful march narrative.
I apologize for making a generalization, but whenever I see anyone of any political alignment suggesting that their issue of choice is being ignored/suppressed the mainstream media, the claim is almost invariably without merit.