Sorry for your troubles, bud.
I find it hard to believe that the wind did it too. But I also find it hard to believe a woman with a bin or anybody else bumping into it accidently could have done that too. I don't even think a drunk stumbling into your 30st bike will do it, and he probably would come off the worse with the bike still upright. This was malicious IMO.
Try this yourself. Delicatley and carefully force one of those bins against your bike to get a feel if it is easy to tip over.....I bet it will stay put. It takes me (a 16st male) to apply a reasonable bit of force with my hand pulling on both handlebar and grab rail to start to send my bike tipping at an angle. So I would be thinking that this was an intentional two handed "pull or shove" jobbie, either by mindless drunken louts passing by topping it over for a craic, or somebody who has a grudge against you.
Either way, what's done is done and if the truth be know....nobody knows how it happened so be careful at pointing the finger. All you can do now is figure out ways to improve the safety when parked up.