Cyclists are allowed under the Highway Code to ride two abreast, it is often safer.
Cars have compulsory insurance due to the potential harm & damage they cause in the huge number of accidents they are involved in & cause. This does not apply to cyclists, the irony being that if more cyclists do have insurance then the humble motorist will see his/her premiums rocket.
As ever there is false equivalence between cars being delayed by 10-15 seconds & putting actual human beings at risk. Strangely you rarely, if ever, see motorists close pass horse riders, blare their horns or shout aggressively at them.
There is a difference between being a cyclist & just a person on a bike messing about.
Last weekend I was close passed & beeped aggressively by a car travelling through the Chatsworth estate. This just sums up the mentality; said driver could have just used the A6 if he was in a hurry.
The most negligent cyclist will cause less damage than the most careful motorist.
Hope I have covered everything. I also drive a BMW.