"justifiable"
adjective
Her actions were quite justifiable (= there was a good reason for them) in the circumstances.

"acceptable"
adjective
satisfactory and able to be agreed to or approved of:
Clearly we need to come to an arrangement that is acceptable to both parties.
So what is an acceptable level of radiation?
This kind of attitude is simply not acceptable.

See any difference in those two Guest TIA???

Now what was it I said Guest TIA???

"perfectly justifiable under certain circumstances?" (Hint - Teribus)

or:

"perfectly acceptable under certain circumstances?" (Hint - Guest TIA)

Pay attention to detail.