Most of the guys from the early 90's had very short careers. They were violent in order to make names for themselves; very few understood cosa nostra and most were just used by Spero. This also holds true for the Colombo's during that same time period.
Gulino pushed Spero in order to make a name for himself and also to show Spero how bad he wanted to get made. He did it for show,not really out of anger, but never expected Spero to have him killed.
These guys were mostly a drug ring that kicked up some money and had rather short careers. Most also ratted,