I think your mindset should be one of loss mitigation.  

Try to find ways to mitigate the damage and then move on. 

Mitigating risk is paramount.

If you are remote investor in Philadelphia so a good property manager can mitigate most challenges

However, we just got the inspection results and the mold results came positive with High to moderate levels of SMUTS, PERICONIA, MYXOMYCETES - MODERATE TO HIGH LEVELS OF "OTHER" SPORE TYPES PRESENT INDOORS.The sellers are willing to work with us but we are afraid that even with the mitigation this will affect our re-sell value or potential lawsuit if we want to rent the basement and the mold re-grow.Please advise, should we get out of the contract and keep looking we are worry and frustrated at the same time.Thanks!

Radon mitigation is a big issue in many parts of the country and a good mitigation system can cost a lot.

Right now my priority is building equity while mitigating cost, so I think it makes sense for me.

To mitigate risk, consider partnering with a local flipper in the area with experience for your first flip.

As Jared notes, there are some ways to mitigate this risk.  

The CDC raised the risk in the rental business and I will need to mitigate it.