Can't Justify The Stupidness

http://www.bbc.co.uk/news/uk-england-london-12003691
"Two police officers stabbed at bus stop in Ealing"

I think that it's inevitable that whilst going after actual criminals both officers and people and sadly the general public are going to get injured.

Although, I do feel it for these officers carrying out "ticket checks". They might have done nothing wrong, or they might be the worst people we could ever meet, however generalising them and judging them doesn't make sense. Regardless, the context of the attack was unprovoked and in this case, the officers were not to blame. These guys know what they signed up for. Although, they didn't expect it in this case, they know the risks. They're no different to the army in the sense that when they sign up, they know what they're doing and putting themselves at this risk is their choice so complaining about it just defeats the purpose of being a police officer.
Yes, some abuse their power, but who in this day and age with power doesn't?
The truth is people say "fuck the pigs" because they want to cause mayhem and they don't like the fact that they're being caught.