as i have experienced a lot of this in my first 2 seasons of lfscar 360° cup with the GTR cars i can give you only one good advice for the series:
do not play around with penalties: everyone who is crashing under caution needs to be disqualified for the rest of the season. everyone who was passing under yellow and did not give back the places needs to be disqualified for the race. end of story. any other wrecking needs to be resulted in a disqualification of the race and if someone is doing it more then 2 times in a race, disqualify him from the series. (one time can be an accident - needs to be reviewed, two times is a bad driver - maybe needs to be kicked out, more times: wrecker - get rid of him.) and one more thing: do not make the same error as i did and let people compete in the series who were actually bad but were friends or relatives. even if its your father, grandpa or cousin or your best friend driving and he is a wrecker or does not understand the simple rules of oval racing, kick him out.
Its a league not a driving school!
its pretty simple, i needed 2 seasons to learn this lesson and this is the only way to go - at least at the beginning.
if the race was that awful, reward some points for the clean drivers and re-do it with the rule enforcements i've just discribed.
if you are not hard on this, i can assure this will happen:
all clean and safe drivers will pull out of the series because they are fed up with stupid noobs crashing during cautions. and you will either end up with an unfinished season due to lack of drivers or with a total mess every race.
be hard on the penalties and disqualify wreckers as soon as possible from the series!
if you are willing to do so, you will be rewarded with better races and better drivers for sure as people see you are taking it serious.
maybe you cancel the result of this race, reward some points for all clean drivers and get out all wreckers. then redo this race.
maybe we can also talk on rules in the series, as real world rules are not always practical in LFS (mainly caution and restart rules)
its practically not possible in lfs to have clean races when you allow passing only after the finish line when doing restarts. i changed rules in the 360 cup to the simple rule: the track is free as soon as the green flag comes out.
this will help you in preventing the cars from concertinas and brake-checking. the leader does not have that much power this way but driving as a whole is much safer.
when is the next race? i might help you with administration.