This is very reassuring for a new investor and great reminder to not get emotional especially with how crazy the market has been.Most importantly, do not do FOMO investing which is what has been happening right now in this current market.

You really have to take emotion out of the hunt.

I would file an incident report of being threatened with the police.This way you have something on record in case another event happens you can show a pattern.I believe the tenant is trying to intimidate you to get some of the deposit back.Keep your emotions in check and communicate everything in writing.Once the former tenant see you cannot be intimidated or manipulated they most just move on.

Don't put blinders on, and don't let emotion rule, this is not a good deal unless you can get it for below $325k most likely.  40-50% (of rents) is a good rule of thumb for expense, vacancy, cap ex, tax, insurance, etc.  

Don't get emotional about it.

I was working out which helped me pphysically and my emotions.

If you're looking for a "best property" then you could be in contention with the legions of SFR buyers that want a home and can therefore afford to pay an emotional premium.  

The tools and resources included, amoung other things,  in the enrollment teach more strategies (and yes, those strategies are taught elsewhere) New investors are also more likely to get emotionally invested in a deal because the initial reviews of it by themselves and their agents seem to promise a high profit, and they can't quite let go of the excitement that "promised" profit.

It's a business, no place for emotions when it comes to money.Difficult to understand if tenants could not care less about the financials of their landlord why their landlord would care about them.

Compassion is a weakness reserved for injured animals, no place in this business for emotions.