Atheists have no regard for life?

According to many Christians, atheists have no regard for life.  Let's take a look...  I'll start with martyrdom, unlike atheism, Christians are to feel proud to lose their life for God

Matthew 10:39
1 Peter 4:16
Revelation 20:4

There are verses which imply that martyrdom is not to be sought out, but it remains that it is a great privilege if it cannot be avoided.  There's a real regard for life.

2 Kings 2:23-24 Elisha tries out his new powers on 42 kids, what awful deed had they done?  Called him bald.
Joshua 10:28-42 Joshua wipes out 7 cities.
           11:8-12 Joshua wipes out 20 cities.
Judges 3:15-16 God and Barak massacre the Canaanites.
           9:23-57 God sends an evil spirit and kills over 1000 people.
           12:4-7 42,000 killed for mispronouncing a word.
1 Samuel 5:1-12 God smites a lot of men with hemorrhoids in their "secret parts".
               6:19 God smites 50,070 people for looking at his arse, I mean ark...
2 Samuel 24:15 God kills 70,000+ because David called a census.

That's nowhere near the entire list, but I'd be here all day.  God's regard for life only goes as far as his patience, which apparently, isn't saying much.  It would then follow that God's followers should have a similar mentality, and many do. Take the majority of the conservative party, with the "give em hell" attitude, 84% of conservatives are Christians.

Now, who has no regard for life?