If your lease agreement doesn't prohibit driving too fast in the residential area of the unit, you need to have a landlord attorney in your state look at the lease you're using, because driving too fast in a residential area may be a civil or criminal infraction or may even rise to the level of endangering the lives of others (neighbors).

Health and safety violationsIf the tenant endangers the health and safety of another tenant or the property itself, the landlord can evict the tenant.Unauthorized occupationIf the tenant has guests who overstay longer than lease agreement allows, the landlord can evict the tenant along with the guest(s).

Your lease or statute may address this, but this is clearly endangering the lives of fellow tenants in the building, which is non-curable.

Arborist whatever, if it falls it can endanger people. 

This guy may be intimidating her and worse endangering her and her child.

If you notify the other owner that their tree is a dangerous tree ((ie it is rotting, dead, etc and endangers your property) and then it falls and damaged your property you have a cause for action against the other owner if they knew the tree was dangerous.  

Ultimately he is responsible for his own safety so long as you are providing a safe dwelling; however, if he is endangering others you have a couple remedies as I see it.

At one point, two of the caps blew off and into the alley below endangering the general public.

They've said I need to learn to be more responsible, and that I'm endangering their financial wellbeing.

Here are some situations where it might make sense, along with considerations for how long one might wait for the situation to improve and what margins might be acceptable for a flip:Expectation of Significant AppreciationStrategic Value or Unique OpportunitiesMarket Rents Expected to IncreaseFix-and-Flip with No Rental StrategyConsiderations Before Buying with Negative Cash Flow:Financial Resilience: Make sure you have enough cash on hand to meet the shortfall without endangering your overall financial situation.exit Strategies: Establish practical, well-defined exit strategies.