It's terrorism, plain and simple.
If you build a man a fire, he'll be warm for a day.
If you set a man on fire, he'll be warm for the rest of his life.
And infrequent. Violence and attempts to terrorize are never acceptable, never. But look at the OP's dates. And take into account the millions of Americans who are pro-life and who would never stoop to terroristic actions, attempted murder, or murder.
I do not support anti abortion violence under any circumstance but find the feigned outrage of people who gladly support the slaughter of millions in the womb laughable and more than a tad disingenuous.
Interesting the last criminal act you cite in the OP is a 2009 incident... Imagine if all the Muslim violence had such isolated occurrences, then the comparisons would be closer to reality instead of being a straw man argument.
The question is more important than the answer!