The problem is poverty in the world and it isn't at all clear that this is caused by inequality. On the other hand, those with  a lot should realize that poverty is a problem for them too as it leads to all kinds of social problems that will inevitably impact them.  Those commenting here who are so vocifeously objecting to "taxes" clearly don't see that. Granted, the government has an obligation to spend wisely and that isn't always the case. 
The inequality statistics do show, however, that by and large there is a failure to address the issue of poverty. One thing Canada could do is at least set a good example and it seems that we don't.