Some questions about security/viruses/torjans etc.

the recent news macs getting unwanted nastiness has got me thinking , have few questions:

1. what's stopping gaining access keychain , therefore every password?

2. when have (for example) flash update pop-up, how know that's , not downloading else?

3. understand, trojan requires me click allow install. why? why can't baddies work around this?

4. checking site "https" - why can't baddies have https websites too?

5. have trojan - why should care?

6. software update - how know in software update legitimate? computer not 'reconfigured' download files elsewhere?

 

thanks replies. i'm wiser now.

 

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