What kind of batteries were used in the bike that went on fire while charging?
In Denmark, we are advised to either keep or bikes indoors during the autumn and winter, or at the very least to take the batteries inside and no-one has mentioned the slightest risk of fire in this connection.
Right now, it is unknown what actually caused the fire on that ship - until it is proved, if indeed it ever is, that a car battery was the cause, it seems pointless to worry that electricly powered cars could be a fire hazard. After all, petrol is infammable and we have lived happily with that risk all my life!
How about agitating for smoke alarms, fire extinguishers and safe electrical wiring, checked regularly by an electrician should be made compulsory in private homes?