Security in any establishment is a must. It ensure safety to visitors and people who work there. A good security firm (or in-house security) ensures security, and on top of that it ensures a conducive environment for both visitors (customers) and other workers. The best security would be those that provide the highest security with less interference to the norm. This is especially considering that most countries are not under emergency (or curfew), and surely not Singapore. We as customers and visitors don't really need machine gun toting personnel, or fierce-looking muscles to make us feel "safe", and "welcomed".
Having said that, I have been to supermarkets, condominiums, government buildings, private and public companies, club houses etc. and I got to learn one good example from all this. Companies (esp. customer-oriented ones) need to invest more in the establishment of "efficient" security in their premises. Efficient in the sense that the security personnel are trained to be vigilant at all time but friendly none-the-less (without compromising the former quality). Just remember that giving out a smile doesn't lessen the "deadly power" of these muscles at work. Conversely, being fierce-looking all the time doesn't work in enhancing security because crooks/terrorists don't buy it (only amateurs might fall for it). Sure enough, regular customers/visitors HATE IT when unreasonable SECURITY hamper their daily norms.
Imagine I'M LOVING IT quality in McD when one day McD decides to hire bouncers to greet customers.