it just flags up anything that looks suspicious it doesn't mean it is harmful so you still need to use your brain and decide whether its safe or not its just a type of warning system and not something which just stops everything.
Yeah exactly. Also it works best if it 'knows' the viruses or the malware. I uses several intelligent ways of recognizing new malware, but this isn't completely safe. Definitely use your own brain if you're doing something Bitcoin related! And use 2FA!