Hacker attacks occur for many reasons:
#1 Highest reason for an attack is to make money from the attack
8/19 Hackers hack Medical company - 4.5 million data sets stolen
8/5 Synology devices get ransomware
8/2 Jimmy John's credit card breach investigation
#2 2nd reason to attack your systems and network is to use your computers on the network to attack other computers (to make money or for political ends)
7/28 elasticsearch vulnerability could cause DDOS attacks
3/15 WordPress vulnerability can be used to attack other sites
#3 next reason to hack computer networks: Just because the hacker can -
The hacker may just want to test their computer skills
Can a business afford to take a chance?
The You tube video linked is a good review of the issues of incident response.
The most interesting item to me is the psychology of security that is included near the end of the video:
Humans are naturally risk averse in gains and risk seeking in losses.
This means that most people will not pay for a vulnerability scan or other security cost. The initial inclination is to take the risk.
Also if there is a risk in a potential gain we will not go the riskier route.
Here are the actual areas in Bruce Schneier's web blog: