Terrorist attacks happen frequently in the Middle East and Africa, but I guess most western new outlets don't care to report on it because it's just black and brown people dying so it's no big deal to them.
Or maybe, instead of racism, it's because it happens so frequently. Or maybe it's because it's a war zone. Maybe there's economic reasons behind covering attacks in the west as well.
Or maybe, not all terrorist attacks in the west get wall-to-wall coverage. France was hit multiple times last year, but only two of those were covered extensively. The rest were covered less than the latest bombings in Turkey, at least in my country.
The attacks that generally aren't covered as extensively as the November 13 attacks, or now the March 22 attacks, are ones that either happen in a conflict zone, where such things happen on a regular basis (thus it's not news anymore, like car crashes), or ones that don't have a lot of victims.
It's not a recent occurence either. Nobody gave a damn when Islamists bombed churches in Poland. In 2000. That's because it caused few deaths (18) and few injuries with low property damage. The London bombings (2005) were covered more extensively because they killed a few more (53), but it also wounded a lot more (over 700) and caused a lot of property damage, and deregulated public transport for days.
Terrorism isn't only about creating as much fear as possible. It's also an attempt to destabilize society. Even if they only blow a leg off a gym instructor, they consider it a victory, because that means a bunch of people will be inconvenienced.
Also, in reaction to your previous post: have you never seen a "don't drink and drive" ad? A "don't do drugs" campaign? Campaign to raise awareness for a specific type of cancer? Or an AIDS awareness campaign?
Point is that people do care about how others die outside of terrorist attacks, and they are trying to prevent it. That's why there's things such as those campaigns, as well as laws that tell people how fast they can drive. So while it doesn't get wall-to-wall daily coverage, people literally are thinking "What can we do to stop this from happening?"