And even if there weren’t, surely there are better things to spend one’s money on than Jaguars?  They could put their money towards, for example, educating poor but physically and/or mentally able people in how they can and why they should do their part for society.

I do somewhat agree that governments don’t tend to spend taxes as they should.  In principle they should be held accountable for this, but the US and UK governments don’t seem to have enough transparency to be truly accountable to anyone.  I suppose the correct response to this, then, is to keep a minimal ‘core wealth’ for a comfortable standard of living and a ‘functional wealth’ to be put into accomplishing whatever task(s) you feel will best help society as a whole, and give the rest away to whatever charity you decide will use it most effectively.