Motorcycles in your bus lane

can anyone please tell me an argument for motorcycles?

they cause far more pollution:

http://camdencyclists.org.uk/camden/campaigns/p2w-buslanes-08-08/p2w-non-CO2-pollutants

have far higher casualty rates
http://en.wikipedia.org/wiki/Motorcycle_safety

cause a lot of noise pollution
[http://www.phhp.ufl.edu/welcome/publications/phhpnewsfall2004.pdf

the evidence provided took me 3 minutes to collect but given a little more time i could provide more reputable sources. but i couldn't be arsed. as most of the people on this forum assert themselves based on their commute to work.

Probably the same like cars. Convenient, you just sit on it, fun to ride and additionally
easier to park in the city.
Higher casualty rates are a pro since there is always a shortage of organ donors.
But in recent years the main market for powerful motorbikes are mostly
older people so I don't know if that has a negative impact.