Ruiner used in a sentence

Ruiner in a sentence as a noun

You are the ruiner of all things good, seriously.

Personally I'd call anyone who is homeless "for fun" a ruiner.

Having parents to fallback on is a great ruiner of motivation for some people.

That guy's a real downer, I hope he get's help... from somebody else..." I understand that it can be a mood-ruiner and people feel ashamed of it even by association but where is the strength in ignoring things?

Canadians should not try this with anything but Kraft unless they are feeling dangerously happy and are in need of a quick day-ruiner.

However, many of the things he describes in the ruiner category are way more typical of mental illness, which to me is deeply problematic.