It's not that it's more aggressive, it's that it's really ****ing ineffective. Basically how football used to be policed in Britain in the 1980s (but with batons being the weapon of choice rather than tear gas). Wait until a situation kicks off and then pile in with force. It didn't work in Britain in the 1980s and it doesn't work now. It just creates more aggro because the people caught up in the pile in are more likely to be innocent bystanders than the actual troublemakers, and the hardcore are off away to regroup and have another pop. How can you have armed gangs roaming around a city carrying weapons and basically wearing uniforms and the police have hardly arrested anyone. If it was policed how public order policing goes in the UK now, everyone would be on film, the ringleaders would be identified and taken out, anyone carrying a weapon would be pulled and the local troublemakers wouldn't be able to get anywhere near the potential flashpoint areas in numbers.