For example: he created/modified Mac to be a bodyguard.
Yes, he was a weapons designer when he was younger and therefore might make a tempting target, but something about that doesn't add up. We've seen no evidence of him having been attacked or under any threat, And he seems to do just fine without the Metallikats around him. So he doesn't seem to be under any threat he can't manage.
In spite of this he seems convinced that "someone(s)" is out to get him, and apparently thinks he's so important that he's a major target.
It gets worse when you look deeper. He's stated that the Metallikats remained evil no matter how many times he "reprogrammed" them. Prior to placing their minds in robots, they were sapient citizens (albeit under imprisonment), but not only does he try to enslave them (trying to make them a maid and bodyguard, whether they wanted to or not) but essentially tried to brainwash them to make them docile servants.
This behavior makes me suspect that Doctor Hackle is not a bumbling old scientist, but dangerously psychotic.
Judging from the above he's shown these symptoms:
- Callous and unemotional traits (towards the Metallikats, at the least).
- Paranoia/delusional ideations.
- Related to the previous: possible delusions of grandeur.