bitcoin is relatively safe, in the long term, don't look at the short term, plenty of manipulation going one, bitcoin need still plenty of time to grow
when everything about its problems will be settled, i beliave you will see the real usage of it, big merchants are waiting that after all, no reason for them to not accept bitcoin
I wouldn't say bitcoin is safe in the long term. Imagine someone bought bitcoins at 1000$ and after a few years they find out the price is at 300$, do you consider that safe? Of course not because it's not.
It could be vice versa as well imagine if someone bought bitcoins at $394 which is current rate and after few years he or she finds out that the value of Bitcoin is $1000 ? The reason behind my point is the pace at which BTC has grown