Five Nights at Freddy's Megathread [FNAF4 released early as usual.]

[Tiger]

And why do they attack him again?

Listen to the phone calls. The guy on the phone tells you about (can't remember exactly) how they want to make you into an animatronic too, or something like that.

Also if they need a security guard either way why would they bother purchasing robots anyway? There is no point.

The robots aren't there for security. It's a pizza place, like Chuck e cheese. They're there for entertainment.