Zimbabwe - Is the coalition government a good idea? Is the death of Mrs Tsvangirai really an accident?

Why did MDC agree to a coalition government. Were Morgan and wife travelling in a presidential convoy? If so how come they are the only ones affected. The man has only been in power, well, "power-sharing" for barely a second and he is in an accident. Mugabe has never been in an accident for nearly 30years in power. Funny that!!