When you use any wallet, safe or not are all by you. You should be carefully when you log in a wallet. You should log in as mew wallet is the same as the metamask or trazor or ledger. You should not be entering private keu or keystore. It's really not safety. You should check the address is right or not. And the certification should be "Myetherwallet INC". If you respect your money, They will be with you.