Positives
If we had time travel it could cuase some of the major events in history like WW1 could of never happened, King Henry could of not beheaded any wives and Japan could of never bombed the USA these things could happen if we had time travel it could be great in the future but then theres the oppisite side...

Negative
There could be so many people joining the website before the greatest admins got there and those people would become admins then it could change when more people go back! There could be a WW3! You could not even be born if a massive disference in the past. We could suffer tons of diffrent attacks.

There could be tons more reasons and this blog leaves you to think about if time travel should be made

But we all know time travel will never be invented as we have seen no-one from the past or a person for the future