Yes, bitcoin is 100% secure. Everybody is transacting here freely and still, there is no news about the security issue of bitcoin. So, I think it is 100% secure.
Yes bitcoin is secure and safe but what's not safe is where we store our coins.
This a "store at your own risk" like if you choose to store it in an online wallet you should be aware that everything can happen here and don't put the blame to anyone.
Having an hardware wallet let's you have a good sleep at night but always remember that you should take all the precautions in storing your coins. Hackers are just around in the corner and ready to take the opportunity when they feel that you're weak.