I am SO disappointed with Air BnB! I can't believe...

I am SO disappointed with Air BnB! I can't believe they have managed to stay in business this long!
First, I had a guest staying 45 days. 30-days into the stay, I rec'd an email from Air BnB telling me that they were having difficulty collecting the 2nd payment and that Air BnB is not liable! Really, a guest can stay without paying & Air BnB is not responsible?! What would keep someone who wants to sam from doing this again & again?!
Second, another completely separate incident: a guest did a lot of damage! She had two small dogs, which we allowed. We send a lot of pictures, receipts, service bills for stained carpets, etc. Air BnB unilaterally made the decision to NOT to allow any funds to be paid to us from the Security Deposit. When I tried to ask about it and try to have a discussion with the case manager, I was told to "move on" that it was not going to happen! We ate all those repairs!
Finally, we also use HomeAway and they are great! Here is what they do/allow that Air BnB does not: adding additional fees for add-on services including SALES TAX, which is required by most cities; the homeowner is paid IN ADVANCE of a guest arriving! There is an option for Damage Protection Insurance which allows us as a homeowner to submit any amount (even small things like broken mugs or stained pillow cases) to get reimburse for. There are a lot of other small reasons but I'll end with, finally, it is MUCH easier to get through to HomeAway's customer service number without being on hold forever!!
VERY disappointed in Air BnB!