A graphic designer develops a campaign poster for a politician. The purpose of this art is

The purpose of this art is to encourage people to vote for said politician and can make their campaign have a huge impact on voters.

Yeah the reason is because the graphic designer wants the politian to win a election so he offers help

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.