That's simply not enough evidence to declare Chaotix scum, simply because he wasn't recruitable.
There is never ever enough evidence in a mafia game, unless a conclusive and solid detective result presents itself. Always present is that element where what pieces that are available add up so coincidentally that it cannot be ignored.

Interestingly, it is probably easier to accumulate a higher quality of information pointing towards Chaotix being scum versus jht being Hades although that's from a purely speculative point of view.

In any case, these are questions you should be asking people who can provide information.

It is perfectly possible that your little cult has been infiltrated by whoever is the last Mafia standing.
If one were to follow this line of inquiry from a purely mechanics perspective, this would suggest that:
a) Mafia are recruitable for some odd reason

And then you must ask yourself, to what end will this allow? Wouldn't infiltrating lets say, Yaro's pro-town network mess around with the town more and be definitely more productive?

Naturally some other options could be present, but you did say infiltrated, meaning sneakily masquerading as someone else in an otherwise un-compromised scenario.