Index usage Brent Ozar script

I'm using sp_blitzIndex to check the health of my database indexation, but I don't understand every column used in the output. I'm talking specifically about "Usage Stats" and "Op Stats". I find many indexes with zero Reads but a thousand writes (example: Reads: 0 Writes: 42,597). Does it mean that the index isn't used at all ? At least not for SELECT statements ? Is it safe to remove it or disable it at first ? PS: My SQL instance hasn't been rebooted for very long time.