I wouldn't let it make your faith in humanity dissipate completely, they just win that way. Bad things usually stand out more than positive, because that's just how
the human brain is wired. That is likely why the world seems so horrible to some people.
But on the subject of actual bad people, well, there's not as much of them as many people seem to believe. As previously mentioned, the negative tends to stand out more vividly than the positive, so it seems like we meet more of the wretched types rather than the friendly. Let's be honest here. What makes a kind person? Respect, friendliness, understanding, empathy, and standing up for what's right. All of those things can be done without opening your mouth or taking action, the last item excluded. However, a person can't be labelled bad by onlookers until they outwardly do something that is considered bad. So of course you'll
see people being negative more often.
That being said, information media has a tendency to push negative things to the forefront of your attention for similar reasons. Keep that in mind; the viewers have influenced informational media to post or talk about negative subjects because it tends to catch their attention more. It's just a theory, but if that's the case, doesn't that mean that many of those viewers are likely people who care greatly about the events that happened, and watch to learn and understand the situation? Most actively bad people would be quite apathetic to anything beyond their own motives, while mere jackasses would probably not care too much about the details and just instantly pass judgement on the situation by the headline.
I do agree that the way some people treat others is disgusting and wrong, and it makes my blood boil to simply hear about. But I keep that anger directed at the actual perpetrators, rather than attributing them to the whole of the human race. They are a part of it, but not all, not even half or a third, likely. On top of that, every person has a shred of good in them, so don't count them out just yet! In all reality, no matter what we do, there will always be bad people. All we can do is stay positive and help all who need it, for if all us people being a boon to the world around us just curled up in a corner and bawled all day instead of doing anything, then negativity would indeed win.
To cite a classic quote: "All that is necessary for the triumph of evil is for good men to do nothing."