Do motorcyclists seem callous about speeding when splitting lanes?

OK, maybe it is not all motorcyclists but some seem to take chances and blast between cars as if they are trying to see how fast they can do it. The law originated, I believe, when motorcycles were simple and had air-cooled engines and had to stay moving or overheat. In gridlock conditions I heard they can split lanes but had to do it at 20mph or lower. Most of the cyclists I see in gridlock seem to blow by at 45mph or more, often appearing like ”Let’s see how fast I can get by these cars”. One driver not looking and shooting a gap right as a cyclist is there can spell disaster, and which aftermath has been witnessed on occasion. Does this behavior of motorcyclists happen where you live? Do they drive between cars at a lower safer speed? What do you think would make a motorcyclist feel taking an extra 5–8 minutes to get through the gridlock at a safer speed, allowing them more time to react to any peril, so unappealing that they feel they must split the lane going 45–60mph?