brigadier said:
went to high school during the California gang wars of the 1990s which I had to live through
The coward criminals tend to be of the young age range while the more daring ones tend to be; as jscott put it, the more experienced ones.
Actually I observed that quite often the opposite was true.
The young ones tend to be the most dangerous because they are often out to prove something to the older ones and their peers.
They have not yet earned the respect that was so important to most of the violent ones.
They would do things that are foolish, 'put in work', and commit excessive violence or react to even the slightest offense in the most excessive manner because they care more about what other gang members will think.
The young ones were the foot soldiers.
Not the brand new ones, but the ones that had been doing it just a few years, and wanted to be known as 'down' 'riders' and various other slang terms and have a reputation for being willing to kill or seriously injure anyone that disrespected them or the gang.
They compensated for not really being tough or experienced by being as vicious, ruthless, and excessive as possible.
These were the age groups that did the most killing and were the most killed.
They died for 'respect'.
Trying to prove something to others.
Even with common criminals it is the young inexperienced one that comes up with ideas like killing all witnesses in a robbery. So instead of being just another common robbery in a bad area and a higher chance of getting away with it, they get a team of detectives and high amount of resources trying to track them down because they are murders, while ruining lives and bringing suffering to families. It actually makes them less likely to get away with it, but they are young and stupid and improvising as they go along. So they come up with stupid ideas.
Likewise they are the ones more apt to just shoot an uncooperative victim after an order is not obeyed, or even if the reward they got was less than expected.
They are less predictable and have not learned methods that allow them to operate outside of jail/prison/ or a graveyard for longer stretches of time yet.
So they do things more likely to get them caught, sent to prison, or killed, like react in unpredictable and excessive ways.
The older gang members and organized crime members in their mid 20-40s by contrast were more reserved, calculating, and certainly predatory, but slower to excessive reaction. Someone only gets to react excessively so many times before they end up dead, and if they lived that long and were not serving life already it was because they didn't do that or learned not to before it caught up with them.
They still care a lot about ego and reputation as a member of organized crime, and so would make an example of those who were blatant and put them on the spot in front of others, but they had a more tempered predatory perspective.
They may plot a hit later for something they consider worth it, but don't generally over react to a slight offense and kill someone in public in front of witnesses that know who they are insuring a conviction for example. But the younger ones would just go full attack mode immediately in the heat of the moment, evidence or longevity be damned.
The young ones reacted on emotion, and a desire to be seen as tough guys which in their minds meant being the most violent.
So generally the young stupid ones tended to be the most dangerous to other people.
That may not fit the romantic fictional notions of Hollywood, glamorizing sophisticated criminals, where smart and sophisticated correlate with more dangerous, but it was true more often than not.