Gun Issue in Tenant's Apartment

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I am hoping to get some input on the community as to how to best handle this issue:

Last week a gun was fired in a tenant's apartment, it passed through his unit and went into another unit.  Luckily nobody was hurt.  

I have not read the police report myself, but another person will be charged with the incident - so it wasn't my tenant's fault - in fact he may not have even been in the unit due to family illness.  

Per the lease, we could theoretically evict him, but since it wasn't him that caused the problem, and he will be paying for all damages, the property management company has suggested that we allow him to stay, but put on notice.  Any issue including noise and he's out.  

I'm mostly inclined to agree with them as long as he's not a danger to the rest of the building, but I'm open to what others have to say.  If it makes a difference he is a member in the armed services too.  

Related issue - to fill the building I offered a rent special $35 off rent for a year.  Given his situation I'm thinking that if it's possible, amend the lease to cancel the special for him.  (Of course discussing with the tenant as part of the process.  I haven't discussed this with the management company yet, so again I'm open to opinions here.  

Thank you ahead of time for any input and feedback it will be much appreciated.